High efficiency ventilation system

ABSTRACT

A high efficiency ventilation system may include a partition configured to separate a supply air stream and a return air stream, an energy recovery ventilator, a heat recovery ventilator, a refrigerant flow controlling condensing unit, and a direct expansion coil. The refrigerant flow controlling condensing unit may be configured to send a refrigerant to the direct expansion coil and configured to receive a refrigerant from the direct expansion coil. The direct expansion coil may be disposed between the energy recovery ventilator and the heat recovery ventilator. The high efficiency ventilation system may be configured to supply ventilation air to a controlled environment at a particular temperature and a particular humidity.

CROSS-REFERENCE TO RELATED APPLICATIONS

This Application claims the benefit of U.S. Provisional Application No.61/906,921, filed Nov. 21, 2013.

FIELD OF THE INVENTION

The present disclosure relates to a system for heating, ventilation, andair conditioning, and, more particularly, to a high efficiencyventilation system.

BACKGROUND OF THE INVENTION

Modern heating, ventilation, and air conditioning systems are typicallydesigned to adjust and maintain both a temperature and a humidity of acontrolled environment. Some controlled environments, e.g., hospitals,primary schools, etc., require air ventilation in addition totemperature and humidity control. In the heating, ventilation, and airconditioning context, air ventilation is a process wherein air from acontrolled environment is continuously replaced with outside air.Organizations such as the American Society of Heating, Refrigerating andAir-Conditioning Engineers have established minimum ventilation raterequirements for specific controlled environments. For example, a newelementary school may be required to ventilate 10.0 cubic feet of airper minute per elementary school occupant.

Compliance with minimum ventilation rate regulations generally increasesan amount of energy required to maintain a desired temperature and adesired humidity within a controlled environment. For example, duringsummer conditions in many regions, a temperature and a humidity ofoutside air is greater than a desired temperature and a desired humiditywithin a controlled environment. Thus, continuously supplying outsideair to the controlled environment may increase a temperature and ahumidity of the controlled environment and additional energy is requiredto decrease the temperature and decrease the humidity of the controlledenvironment to the desired temperature and the desired humidity.Accordingly, there is a need to reduce an amount of additional energyrequired to comply with minimum ventilation rate regulations.

BRIEF SUMMARY OF THE INVENTION

A high efficiency ventilation system is presented. In one or moreembodiments, a high efficiency ventilation system may comprise apartition configured to separate a supply air stream and a return airstream, an energy recovery ventilator, a heat recovery ventilator, arefrigerant flow controlling condensing unit, and a direct expansioncoil. Illustratively, the refrigerant flow controlling condensing unitmay be directly or indirectly connected to the direct expansion coil. Inone or more embodiments, the refrigerant flow controlling condensingunit may be configured to facilitate a transfer of a refrigerant fromthe refrigerant flow controlling condensing unit to the direct expansioncoil. Illustratively, the refrigerant flow controlling condensing unitmay be configured to facilitate a transfer of a refrigerant from thedirect expansion coil to the refrigerant flow controlling condensingunit. In one or more embodiments, the direct expansion coil may bedisposed between the energy recovery ventilator and the heat recoveryventilator. Illustratively, the high efficiency ventilation system maybe configured to ventilate a controlled environment. In one or moreembodiments, the high efficiency ventilation system may be configured tosupply ventilation air to the controlled environment at a particulartemperature and a particular humidity.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and further advantages of the present invention may be betterunderstood by referring to the following description in conjunction withthe accompanying drawings in which like reference numerals indicateidentical or functionally similar elements:

FIG. 1 is a schematic diagram illustrating a high efficiency ventilationsystem in a heat pump configuration;

FIG. 2 is a schematic diagram illustrating a high efficiency ventilationsystem in a heat recovery configuration;

FIG. 3 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary coil in outside air stream;

FIG. 4 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary coil in return air stream;

FIG. 5 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary refrigerant flow controlling condensing unitfor outside air stream;

FIG. 6 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary refrigerant flow controlling condensing unitfor return air stream.

DETAILED DESCRIPTION OF AN ILLUSTRATIVE EMBODIMENT

FIG. 1 is a schematic diagram illustrating a high efficiency ventilationsystem in a heat pump configuration 100. Illustratively, high efficiencyventilation system in a heat pump configuration 100 may be configured toventilate a controlled environment 115 in accordance with AmericanSociety of Heating, Refrigerating and Air-Conditioning Engineersrequired minimum ventilation rates. In one or more embodiments, highefficiency ventilation system in a heat pump configuration 100 may beconfigured to ventilate a controlled environment 115 in accordance withInternational Mechanical Code required minimum ventilation rates.Illustratively, high efficiency ventilation system in a heat pumpconfiguration 100 may be configured to ventilate a controlledenvironment 115, e.g., high efficiency ventilation system in a heat pumpconfiguration 100 may be configured to supply air at a controlledtemperature and humidity to controlled environment 115 via a supply airstream 142. In one or more embodiments, high efficiency ventilationsystem in a heat pump configuration 100 may be configured to control atemperature and a humidity of a controlled environment 115, e.g., highefficiency ventilation system in a heat pump configuration 100 may beconfigured to control a temperature and a humidity of controlledenvironment 115 via supply air stream 142. Illustratively, highefficiency ventilation system in a heat pump configuration 100 may beconfigured to ventilate a controlled environment 115, e.g., highefficiency ventilation system in a heat pump configuration 100 may beconfigured to remove air from controlled environment 115 via a returnair stream 143. In one or more embodiments, high efficiency ventilationsystem in a heat pump configuration 100 may be configured to control atemperature and a humidity of a controlled environment 115 via returnair stream 143. Illustratively, supply air stream 142 and return airstream 143 may be separated by a partition 111, e.g., partition 111 maybe configured to hermetically separate supply air stream 142 and returnair stream 143.

In one or more embodiments, partition 111 may be configured to separatean outside air stream 141 and an exhaust air stream 144, e.g., partition111 may be configured to hermetically separate outside air stream 141and exhaust air stream 144. Illustratively, partition 111 may beconfigured to separate a first supply air zone 150, a second supply airzone 151, a third supply air zone 152, a fourth supply air zone 153, afifth supply air zone 154, and a sixth supply air zone 155 from a firstreturn air zone 160, a second return air zone 161, a third return airzone 162, and a fourth return air zone 163, e.g., partition 111 may beconfigured to hermetically separate a first supply air zone 150, asecond supply air zone 151, a third supply air zone 152, a fourth supplyair zone 153, a fifth supply air zone 154, and a sixth supply air zone155 from a first return air zone 160, a second return air zone 161, athird return air zone 162, and a fourth return air zone 163.

In one or more embodiments, a portion of partition 111 may comprise abypass damper configured to temporarily open a hermetically sealedbarrier between supply air stream 142 and return air stream 143, e.g., aportion of partition 111 may comprise a bypass damper configured totemporarily facilitate an egress of air out from one or more supply airzones and an ingress of air into one or more return air zones or anegress of air out from one or more return air zones and an ingress ofair into one or more supply air zones. Illustratively, a portion ofpartition 111 may comprise a bypass damper configured to facilitate amaintenance operation, a defrost operation, etc. In one or moreembodiments, a portion of partition 111 may comprise a bypass damperdisposed between first return air zone 160 and fifth supply air zone154.

In one or more embodiments, high efficiency ventilation system in a heatpump configuration 100 may comprise a refrigerant flow controllingcondensing unit 105, a direct expansion coil 110, an energy recoveryventilator 120, and a heat recovery ventilator 125. Illustratively,direct expansion coil 110 may be disposed between energy recoveryventilator 120 and heat recovery ventilator 125, e.g., direct expansioncoil 110 may be disposed downstream of energy recovery ventilator 120and upstream of heat recovery ventilator 125. In one or moreembodiments, refrigerant flow controlling condensing unit 105 may bedirectly or indirectly connected to direct expansion coil 110 by aliquid line 106 and a gas and gas and suction line 107. Illustratively,liquid line 106 may comprise a pipe configured to facilitate a transferof a refrigerant from refrigerant flow controlling condensing unit 105to direct expansion coil 110. In one or more embodiments, gas andsuction line 107 may comprise a pipe configured to facilitate a transferof a refrigerant from direct expansion coil 110 to refrigerant flowcontrolling condensing unit 105. Illustratively, refrigerant flowcontrolling condensing unit 105 may comprise a variable refrigerantvolume condensing unit configured to distribute a refrigerant to one ormore coil units wherein each coil unit may be configured to control atemperature and a humidity of a conditioned space, e.g., refrigerantflow controlling condensing unit 105 may comprise a variable refrigerantvolume condensing unit configured to distribute a refrigerant to one ormore direct expansion coils 110. In one or more embodiments, refrigerantflow controlling condensing unit 105 may comprise a variable refrigerantflow condensing unit configured to distribute a refrigerant to one ormore coil units wherein each coil unit may be configured to control atemperature and a humidity of a conditioned space, e.g., refrigerantflow controlling condensing unit 105 may comprise a variable refrigerantflow condensing unit configured to distribute a refrigerant to one ormore direct expansion coils 110. Illustratively, refrigerant flowcontrolling condensing unit 105 may comprise a compressor 170, a fan,and a heat exchanger. In one or more embodiments, refrigerant flowcontrolling condensing unit 105 may comprise a refrigerant flow controlsystem configured to control the distribution of a refrigerant to one ormore coil units, e.g., refrigerant flow controlling condensing unit 105may comprise a refrigerant flow control system configured to control thedistribution of a refrigerant to one or more direct expansion coils 110.Illustratively, refrigerant flow controlling condensing unit 105 may bewater cooled. In one or more embodiments, refrigerant flow controllingcondensing unit 105 may be air cooled.

Illustratively, energy recovery ventilator 120 may be configured torecover sensible energy, e.g., energy recovery ventilator 120 may beconfigured for temperature recovery. In one or more embodiments, energyrecovery ventilator 120 may be configured to recover latent energy,e.g., energy recovery ventilator 120 may be configured for moisturerecovery. Illustratively, energy recovery ventilator 120 may beconfigured to recover sensible energy and latent energy. In one or moreembodiments, energy recovery ventilator 120 may comprise an enthalpywheel configured to recover sensible energy and latent energy.Illustratively, energy recovery ventilator 120 may comprise a sensibleonly energy recovery wheel configured to recover sensible energy. In oneor more embodiments, energy recovery ventilator 120 may comprise anenergy recovery wheel configured to recover sensible energy and latentenergy. For example, energy recovery ventilator 120 may comprise anenthalpy wheel configured to recover sensible energy and latent energy.Illustratively, energy recovery ventilator 120 may comprise a desiccantwheel, e.g., energy recovery ventilator may comprise an active desiccantwheel or a passive desiccant wheel. In one or more embodiments, energyrecovery ventilator 120 may comprise a desiccant molecular sieve coatingconfigured to facilitate moisture absorption. Illustratively, energyrecovery ventilator 120 may comprise a desiccant molecular sieve coatingconfigured to prevent contamination of supply air stream 142, e.g.,energy recovery ventilator 120 may comprise a desiccant molecular sievecoating configured to minimize cross-contamination of return air stream143 pollutants into supply air stream 142. In one or more embodiments,energy recovery ventilator 120 may comprise a desiccant molecular sievecoating having a plurality of apertures wherein each aperture of theplurality of apertures has an aperture diameter in a range of 0.25 to4.0 angstroms, e.g., energy recovery ventilator 120 may comprise adesiccant molecular sieve coating having a plurality of apertureswherein each aperture of the plurality of apertures has an aperturediameter of 3.0 angstroms. Illustratively, energy recovery ventilator120 may comprise a desiccant molecular sieve coating having a pluralityof apertures wherein each apertures of the plurality of apertures has anaperture diameter less than 0.25 angstroms or greater than 4.0angstroms. In one or more embodiments, energy recovery ventilator 120may comprise any type of desiccant, e.g., energy recovery ventilator maycomprise a silica gel desiccant, an oxidized aluminum desiccant, etc.

Illustratively, energy recovery ventilator 120 may comprise afixed-plate heat exchanger, e.g., energy recovery ventilator 120 maycomprise alternating layers of separated plates. In one or moreembodiments, energy recovery ventilator 120 may comprise a fixed-plateheat exchanger in a cross-flow configuration. Illustratively, energyrecovery ventilator 120 may comprise a fixed-plate heat exchanger in acounter-flow configuration. In one or more embodiments, energy recoveryventilator 120 may comprise a fixed-plate heat exchanger having platesmanufactured from a water vapor permeable material. Illustratively,energy recovery ventilator 120 may comprise a fixed-plate heat exchangerhaving plates manufactured from microporous polymeric membranes. In oneor more embodiments, energy recovery ventilator 120 may comprise a heatpipe heat exchanger, e.g., energy recovery ventilator 120 may comprise aplurality of tubes wherein each tube comprises an internal capillarywick material. Illustratively, energy recovery ventilator 120 maycomprise a thermosiphon heat exchanger, e.g., energy recovery ventilator120 may comprise a plurality of sealed tubes. In one or moreembodiments, energy recovery ventilator 120 may comprise a thermosiphonheat exchanger in a single coil configuration. Illustratively, energyrecovery ventilator 120 may comprise a thermosiphon heat exchanger in amultiple coil configuration. In one or more embodiments, energy recoveryventilator 120 may comprise a coil energy recovery loop, e.g., energyrecovery ventilator 120 may comprise a runaround loop.

Illustratively, energy recovery ventilator 120 may be configured tofacilitate a heat transfer, e.g., energy recovery ventilator 120 may beconfigured facilitate a heat transfer between air streams separated bypartition 111. In one or more embodiments, energy recovery ventilator120 may be configured to facilitate a transfer of thermal energy, e.g.,energy recovery ventilator 120 may be configured to facilitate atransfer of thermal energy by conduction, convection, radiation,advection, etc. Illustratively, energy recovery ventilator 120 may beconfigured to facilitate a heat transfer between outside air stream 141and return air stream 143, e.g., energy recovery ventilator 120 may beconfigured to facilitate a transfer of thermal energy from outside airstream 141 to return air stream 143 or from return air stream 143 tooutside air stream 141. During summer conditions, energy recoveryventilator 120 may be configured to facilitate a heat transfer betweenoutside air stream 141 and return air stream 143, e.g., energy recoveryventilator 120 may be configured to facilitate a heat transfer bydecreasing a temperature of outside air stream 141 and increasing atemperature of return air stream 143. During winter conditions, energyrecovery ventilator 120 may be configured to facilitate a heat transferbetween outside air stream 141 and return air stream 143, e.g., energyrecovery ventilator 120 may be configured to facilitate a heat transferby increasing a temperature of outside air stream 141 and decreasing atemperature of return air stream 143. In one or more embodiments, energyrecovery ventilator 120 may be configured to facilitate a moisturetransfer, e.g., energy recovery ventilator 120 may be configured tofacilitate a moisture transfer between air streams separated bypartition 111. Illustratively, energy recovery ventilator 120 may beconfigured to facilitate a transfer of moisture from outside air stream141 to return air stream 143 or from return air stream 143 to outsideair stream 141. During summer conditions, energy recovery ventilator 120may be configured to facilitate a moisture transfer between outside airstream 141 and return air stream 143, e.g., energy recovery ventilator120 may be configured to facilitate a moisture transfer by decreasing ahumidity of outside air stream 141 and increasing a humidity of returnair stream 143. During winter conditions, energy recovery ventilator 120may be configured to facilitate a moisture transfer between outside airstream 141 and return air stream 143, e.g., energy recovery ventilator120 may be configured to facilitate a moisture transfer by increasing ahumidity of outside air stream 141 and decreasing a humidity of returnair stream 143.

In one or more embodiments, energy recovery ventilator 120 may beconfigured to facilitate a heat transfer and a moisture transfer, e.g.,energy recovery ventilator 120 may be configured to simultaneouslyfacilitate a heat transfer and a moisture transfer between air streamsseparated by partition 111. During summer conditions, energy recoveryventilator 120 may be configured to facilitate a heat transfer and amoisture transfer between outside air stream 141 and return air stream143, e.g., energy recovery ventilator 120 may be configured tofacilitate a heat transfer and a moisture transfer by decreasing atemperature and decreasing a humidity of outside air stream 141 andincreasing a temperature and increasing a humidity of return air stream143. During winter conditions, energy recovery ventilator 120 may beconfigured to facilitate a heat transfer and a moisture transfer betweenoutside air stream 141 and return air stream 143, e.g., energy recoveryventilator 120 may be configured to facilitate a moisture transfer byincreasing a temperature and increasing a humidity of outside air stream141 and decreasing a temperature and decreasing a humidity of return airstream 143. Illustratively, energy recovery ventilator 120 may beconfigured to recover sensible energy wherein outside air stream 141 mayingress first supply air zone 150 at a first temperature and outside airstream 141 may ingress second supply air zone 151 at a secondtemperature. In one or more embodiments, the second temperature ofoutside air stream 141 may be less than the first temperature of outsideair stream 141, e.g., the second temperature of outside air stream 141may be less than the first temperature of outside air stream 141 duringsummer conditions. Illustratively, the second temperature of outside airstream 141 may be greater than the first temperature of outside airstream 141, e.g., the second temperature of outside air stream 141 maybe greater than the first temperature of outside air stream 141 duringwinter conditions. In one or more embodiments, energy recoveryventilator 120 may be configured to recover sensible energy whereinreturn air stream 143 may ingress second return air zone 161 at a firsttemperature and return air stream 143 may ingress third return air zone162 at a second temperature. Illustratively, the second temperature ofreturn air stream 143 may be less than the first temperature of returnair stream 143, e.g., the second temperature of return air stream 143may be less than the first temperature of return air stream 143 duringwinter conditions. In one or more embodiments, the second temperature ofreturn air stream 143 may be greater than the first temperature ofreturn air stream 143, e.g., the second temperature of return air stream143 may be greater than the first temperature of return air stream 143during summer conditions. Illustratively, energy recovery ventilator 120may be configured to recover latent energy wherein outside air stream141 may ingress first supply air zone 150 having a first moisturecontent and outside air stream 141 may ingress second supply air zone151 having a second moisture content. In one or more embodiments, thesecond moisture content of outside air stream 141 may be less than thefirst moisture content of outside air stream 141, e.g., the secondmoisture content of outside air stream 141 may be less than the firstmoisture content of outside air stream 141 during summer conditions.Illustratively, the second moisture content of outside air stream 141may be greater than the first moisture content of outside air stream141, e.g., the second moisture content of outside air stream 141 may begreater than the first moisture content of outside air stream 141 duringwinter conditions. In one or more embodiments, energy recoveryventilator 120 may be configured to recover latent energy wherein returnair stream 143 may ingress second return air zone 161 having a firstmoisture content and return air stream 143 may ingress third return airzone 162 having a second moisture content. Illustratively, the secondmoisture content of return air stream 143 may be less than the firstmoisture content of return air stream 143, e.g., the second moisturecontent of return air stream 143 may be less than the first moisturecontent of return air stream 143 during winter conditions. In one ormore embodiments, the second moisture content of return air stream 143may be greater than the first moisture content of return air stream 143,e.g., the second moisture content of return air stream 143 may begreater than the first moisture content of return air stream 143 duringsummer conditions.

Illustratively, heat recovery ventilator 125 may be configured torecover sensible energy, e.g., heat recovery ventilator 125 may beconfigured for temperature recovery. In one or more embodiments, heatrecovery ventilator 125 may be configured to recover latent energy,e.g., heat recovery ventilator 125 may be configured for moisturerecovery. Illustratively, heat recovery ventilator 125 may be configuredto recover sensible energy and latent energy. In one or moreembodiments, heat recovery ventilator 125 may comprise an enthalpy wheelconfigured to recover sensible energy and latent energy. Illustratively,heat recovery ventilator 125 may comprise a sensible only energyrecovery wheel configured to recover sensible energy. In one or moreembodiments, heat recovery ventilator 125 may comprise an activedesiccant wheel or a passive desiccant wheel.

Illustratively, heat recovery ventilator 125 may comprise a fixed-plateheat exchanger, e.g., heat recovery ventilator 125 may comprisealternating layers of separated plates. In one or more embodiments, heatrecovery ventilator 125 may comprise a fixed-plate heat exchanger in across-flow configuration. Illustratively, heat recovery ventilator 125may comprise a fixed-plate heat exchanger in a counter-flowconfiguration. In one or more embodiments, heat recovery ventilator 125may comprise a fixed-plate heat exchanger having plates manufacturedfrom a water vapor permeable material. Illustratively, heat recoveryventilator 125 may comprise a fixed-plate heat exchanger having platesmanufactured from microporous polymeric membranes. In one or moreembodiments, heat recovery ventilator 125 may comprise a heat pipe heatexchanger, e.g., heat recovery ventilator 125 may comprise a pluralityof tubes wherein each tube comprises an internal capillary wickmaterial. Illustratively, heat recovery ventilator 125 may comprise athermosiphon heat exchanger, e.g., heat recovery ventilator 125 maycomprise a plurality of sealed tubes. In one or more embodiments, heatrecovery ventilator 125 may comprise a thermosiphon heat exchanger in asingle coil configuration. Illustratively, heat recovery ventilator 125may comprise a thermosiphon heat exchanger in a multiple coilconfiguration. In one or more embodiments, heat recovery ventilator 125may comprise a coil energy recovery loop, e.g., heat recovery ventilator125 may comprise a runaround loop.

Illustratively, heat recovery ventilator 125 may be configured tofacilitate a heat transfer, e.g., heat recovery ventilator 125 may beconfigured facilitate a heat transfer between air streams separated bypartition 111. In one or more embodiments, heat recovery ventilator 125may be configured to facilitate a transfer of thermal energy, e.g., heatrecovery ventilator 125 may be configured to facilitate a transfer ofthermal energy by conduction, convection, radiation, advection, etc.Illustratively, heat recovery ventilator 125 may be configured tofacilitate a heat transfer between outside air stream 141 and return airstream 143, e.g., heat recovery ventilator 125 may be configured tofacilitate a transfer of thermal energy from outside air stream 141 toreturn air stream 143 or from return air stream 143 to outside airstream 141. During summer conditions, heat recovery ventilator 125 maybe configured to facilitate a heat transfer between outside air stream141 and return air stream 143, e.g., heat recovery ventilator 125 may beconfigured to facilitate a heat transfer by decreasing a temperature ofoutside air stream 141 and increasing a temperature of return air stream143. During winter conditions, heat recovery ventilator 125 may beconfigured to facilitate a heat transfer between outside air stream 141and return air stream 143, e.g., heat recovery ventilator 125 may beconfigured to facilitate a heat transfer by increasing a temperature ofoutside air stream 141 and decreasing a temperature of return air stream143. In one or more embodiments, heat recovery ventilator 125 may beconfigured to facilitate a moisture transfer, e.g., heat recoveryventilator 125 may be configured to facilitate a moisture transferbetween air streams separated by partition 111. Illustratively, heatrecovery ventilator 125 may be configured to facilitate a transfer ofmoisture from outside air stream 141 to return air stream 143 or fromreturn air stream 143 to outside air stream 141. During summerconditions, heat recovery ventilator 125 may be configured to facilitatea moisture transfer between outside air stream 141 and return air stream143, e.g., heat recovery ventilator 125 may be configured to facilitatea moisture transfer by decreasing a humidity of outside air stream 141and increasing a humidity of return air stream 143. During winterconditions, heat recovery ventilator 125 may be configured to facilitatea moisture transfer between outside air stream 141 and return air stream143, e.g., heat recovery ventilator 125 may be configured to facilitatea moisture transfer by increasing a humidity of outside air stream 141and decreasing a humidity of return air stream 143.

Illustratively, heat recovery ventilator 125 may be configured torecover sensible energy wherein outside air stream 141 may ingressfourth supply air zone 153 at a first temperature and outside air stream141 may ingress fifth supply air zone 154 at a second temperature. Inone or more embodiments, the second temperature of outside air stream141 may be less than the first temperature of outside air stream 141,e.g., the second temperature of outside air stream 141 may be less thanthe first temperature of outside air stream 141 during summerconditions. Illustratively, the second temperature of outside air stream141 may be less than the first temperature of outside air stream 141during winter conditions. In one or more embodiments, the secondtemperature of outside air stream 141 may be greater than the firsttemperature of outside air stream 141, e.g., the second temperature ofoutside air stream 141 may be greater than the first temperature ofoutside air stream 141 during winter conditions. Illustratively, thesecond temperature of outside air stream 141 may be greater than thefirst temperature of outside air stream 141 during summer conditions. Inone or more embodiments, heat recovery ventilator 125 may be configuredto recover sensible energy wherein return air stream 143 may ingressfirst return air zone 160 at a first temperature and return air stream143 may ingress second return air zone 161 at a second temperature.Illustratively, the second temperature of return air stream 143 may beless than the first temperature of return air stream 143, e.g., thesecond temperature of return air stream 143 may be less than the firsttemperature of return air stream 143 during winter conditions. In one ormore embodiments, the second temperature of return air stream 143 may beless than the first temperature of return air stream 143 during summerconditions. Illustratively, the second temperature of return air stream143 may be greater than the first temperature of return air stream 143,e.g., the second temperature of return air stream 143 may be greaterthan the first temperature of return air stream 143 during summerconditions. In one or more embodiments, the second temperature of returnair stream 143 may be greater than the first temperature of return airstream 143 during winter conditions.

In one or more embodiments, direct expansion coil 110 may be disposed inthird air supply zone 152, e.g., direct expansion coil 110 may bedisposed in second supply air zone 151 or direct expansion coil 110 maybe disposed in fourth supply air zone 153. For example, direct expansioncoil 110 may be disposed in second supply air zone 151, third supply airzone 152, and fourth supply air zone 153. Illustratively, second supplyair zone 151, third supply air zone 152, and fourth supply air zone 153may comprise a single supply air zone, e.g., outside air stream 141 mayhave a same temperature and moisture content in second supply air zone,third supply air zone 152, and fourth supply air zone. In one or moreembodiments, partition 111 may be configured to separate directexpansion coil 110 from return air stream 143, e.g., partition 111 maybe configured to hermetically separate direct expansion coil 110 fromreturn air stream 143. In one or more embodiments, direct expansion coil110 may be configured to increase or decrease a temperature of outsideair stream 141. Illustratively, outside air stream 141 may ingresssecond supply air zone 151 at a first temperature and outside air stream141 may ingress fourth supply air zone 153 at a second temperature. Inone or more embodiments, the second temperature of outside air stream141 may be less than the first temperature of outside air stream 141,e.g., the second temperature of outside air stream 141 may be less thanthe first temperature of outside air stream 141 during summerconditions. Illustratively, the second temperature of outside air stream141 may be greater than the first temperature of outside area stream141, e.g., the second temperature of outside air stream 141 may begreater than the first temperature of outside air stream 141 duringsummer conditions.

Illustratively, high efficiency ventilation system in a heat pumpconfiguration 100 may comprise an air exhauster 130 and an air supplier135. In one or more embodiments, air exhauster 130 may comprise a fan ora blower. Illustratively, air exhauster 130 may be configured tofacilitate an exhaust of return air stream 143, e.g., air exhauster 130may be configured to transfer exhaust air stream 144 out from fourthreturn air zone 163 and into an uncontrolled environment. In one or moreembodiments, air supplier 135 may comprise a fan or a blower.Illustratively, air supplier 135 may be configured to facilitate asupply of outside air stream 141, e.g., air supplier 135 may beconfigured to transfer supply air stream 142 out from sixth supply airzone 155 and into controlled environment 115.

In one or more embodiments, high efficiency ventilation system in a heatpump configuration 100 may be configured to ventilate a controlledenvironment 115 wherein outside air stream 141 may ingress first supplyair zone 150 at a first temperature and having a first moisture content.Illustratively, energy recovery ventilator 120 may be configured toincrease a temperature of outside air stream 141 or decrease atemperature of outside air stream 141. In one or more embodiments,energy recovery ventilator 120 may be configured to increase a moisturecontent of outside air stream 141 or decrease a moisture content ofoutside air stream 141. Illustratively, high efficiency ventilationsystem in a heat pump configuration 100 may be configured to ventilate acontrolled environment 115 wherein outside air stream 141 may ingresssecond supply air zone 151 at a second temperature and having a secondmoisture content. In one or more embodiments, the second temperature ofoutside air stream 141 may be greater than the first temperature ofoutside air stream 141. Illustratively, the second temperature ofoutside air stream 141 may be less than the first temperature of outsideair stream 141. In one or more embodiments, the second temperature ofoutside air stream 141 may be an unchanged temperature from the firsttemperature of outside air stream 141. Illustratively, the secondmoisture content of outside air stream 141 may be greater than the firstmoisture content of outside air stream 141. In one or more embodiments,the second moisture content of outside air stream 141 may be less thanthe first moisture content of outside air stream 141. Illustratively,the second moisture content of outside air stream 141 may be anunchanged moisture content from the first moisture content of outsideair stream 141. In one or more embodiments, direct expansion coil 110may be configured to increase a temperature of outside air stream 141 ordecrease a temperature of outside air stream 141. Illustratively, highefficiency ventilation system in a heat pump configuration 100 may beconfigured to ventilate a controlled environment 115 wherein outside airstream 141 may ingress fourth supply air zone 153 at a thirdtemperature. In one or more embodiments, the third temperature ofoutside air stream 141 may be greater than the second temperature ofoutside air stream 141. Illustratively, the third temperature of outsideair stream 141 may be less than the second temperature of outside airstream 141. In one or more embodiments, the third temperature of outsideair stream 141 may be an unchanged temperature from the secondtemperature of outside air stream 141. Illustratively, heat recoveryventilator 125 may be configured to increase a temperature of outsideair stream 141 or decrease a temperature of outside air stream 141. Inone or more embodiments, high efficiency ventilation system in a heatpump configuration 100 may be configured to ventilate a controlledenvironment 115 wherein outside air stream 141 may ingress fifth supplyair zone 154 at a fourth temperature. Illustratively, the fourthtemperature of outside air stream 141 may be greater than the thirdtemperature of outside air stream 141. In one or more embodiments, thefourth temperature of outside air stream 141 may be less than the thirdtemperature of outside air stream 141. Illustratively, the fourthtemperature of outside air stream 141 may be an unchanged temperaturefrom the third temperature of outside air stream 141. In one or moreembodiments, air supplier 135 may be configured to supply outside airstream 141 to controlled environment 115 as supply air stream 142.Illustratively, supply air stream 142 may comprise outside air stream141, e.g., supply air stream 142 may comprise outside air stream 141 atthe fourth temperature and having the second moisture content.

In one or more embodiments, high efficiency ventilation system in a heatpump configuration 100 may be configured to ventilate a controlledenvironment 115 wherein return stream 143 may ingress first return airzone 160 at a first temperature and having a first moisture content.Illustratively, heat recovery ventilator 125 may be configured toincrease a temperature of return air stream 143 or decrease atemperature of return air stream 143. In one or more embodiments, highefficiency ventilation system in a heat pump configuration 100 may beconfigured to ventilate a controlled environment 115 wherein outsidereturn stream 143 may ingress second return air zone 161 at a secondtemperature. Illustratively, the second temperature of return air stream143 may be greater than the first temperature of return air stream 143.In one or more embodiments, the second temperature of return air stream143 may be less than the first temperature of return air stream 143.Illustratively, the second temperature of return air stream 143 may bean unchanged temperature from the first temperature of return air stream143. In one or more embodiments, energy recovery ventilator 120 may beconfigured to increase a temperature of return air stream 143 ordecrease a temperature of return air stream 143. Illustratively, energyrecovery ventilator 120 may be configured to increase a moisture contentof return air stream 143 or decrease a moisture content of return airstream 143. In one or more embodiments, high efficiency ventilationsystem in a heat pump configuration 100 may be configured to ventilate acontrolled environment 115 wherein return stream 143 may ingress thirdreturn air zone 162 at a third temperature and having a second moisturecontent. In one or more embodiments, the third temperature of return airstream 143 may be greater than the second temperature of return airstream 143. Illustratively, the third temperature of return air stream143 may be less than the second temperature of return air stream 143. Inone or more embodiments, the third temperature of return air stream 143may be an unchanged temperature from the second temperature of returnair stream 143. Illustratively, the second moisture content of returnair stream 143 may be greater than the first moisture content of returnair stream 143. In one or more embodiments, the second moisture contentof return air stream 143 may be less than the first moisture content ofreturn air stream 143. Illustratively, the second moisture content ofreturn air stream 143 may be an unchanged moisture content from thefirst moisture content of return air stream 143. In one or moreembodiments, air exhauster 130 may be configured to exhaust return airstream 143 to an uncontrolled environment as exhaust air stream 144.Illustratively, exhaust air stream 144 may comprise return air stream143, e.g., exhaust air stream 144 may comprise return air stream at thethird temperature and having the second moisture content.

FIG. 2 is a schematic diagram illustrating a high efficiency ventilationsystem in a heat recovery configuration 200. In one or more embodiments,high efficiency ventilation system in a heat recovery configuration 200may comprise a first branch selector unit 210, a second branch selectorunit 220, and a fan coil unit 230. Illustratively, first branch selectorunit 210 may be disposed between refrigerant flow controlling condensingunit 105 and direct expansion coil 110. In one or more embodiments,first branch selector unit 210 may be directly or indirectly connectedto direct expansion coil 110 by liquid line 106 and gas and suction line107. Illustratively, refrigerant flow controlling condensing unit 105may be configured to facilitate a transfer of a refrigerant fromrefrigerant flow controlling condensing unit 105 to first branchselector unit 210. In one or more embodiments, refrigerant flowcontrolling condensing unit 105 may be configured to facilitate atransfer of a refrigerant from first branch selector unit 210 torefrigerant flow controlling condensing unit 105. Illustratively, firstbranch selector unit 210 may be directly or indirectly connected torefrigerant flow controlling condensing unit 105 by a gas and suctionline 206, a suction line 207, and a liquid line 208. In one or moreembodiments, first branch selector unit 210 may be connected to gas andsuction line 206 at a gas and suction line junction 216, e.g., firstbranch selector unit 210 may be connected to gas and suction linejunction 216 by a first branch selector unit gas and suction line 211.For example, gas and suction line junction 216 may comprise a Refnetjoint. Illustratively, first branch selector unit 210 may be connectedto suction line 207 at a suction line junction 217, e.g., first branchselector unit 210 may be connected to suction line junction 217 by afirst branch selector unit suction line 212. For example, suction linejunction 217 may comprise a Refnet joint. In one or more embodiments,first branch selector unit 210 may be connected to liquid line 208 at aliquid line junction 218, e.g., first branch selector unit 210 may beconnected to liquid line junction 218 by a first branch selector unitliquid line 213. For example, liquid line junction 218 may comprise aRefnet joint. Illustratively, first branch selector unit 210 may beconfigured to facilitate a transfer of a refrigerant from first branchselector unit 210 to direct expansion coil 110. In one or moreembodiments, first branch selector unit 210 may be configured tofacilitate a transfer of a refrigerant from direct expansion coil 110 tofirst branch selector unit 210. Illustratively, first branch selectorunit 210 may be configured to facilitate a transfer of a refrigerantfrom refrigerant flow controlling condensing unit 105 to directexpansion coil 110. In one or more embodiments, first branch selectorunit 210 may be configured to facilitate a transfer of a refrigerantfrom direct expansion coil 110 to refrigerant flow controllingcondensing unit 105.

Illustratively, second branch selector unit 220 may be disposed betweenrefrigerant flow controlling condensing unit 105 and fan coil unit 230.In one or more embodiments, second branch selector unit 220 may bedirectly or indirectly connected to fan coil unit 230 by fan coil liquidline 226 and fan coil gas and suction line 227. Illustratively,refrigerant flow controlling condensing unit 105 may be configured tofacilitate a transfer of a refrigerant from refrigerant flow controllingcondensing unit 105 to second branch selector unit 220. In one or moreembodiments, refrigerant flow controlling condensing unit 105 may beconfigured to facilitate a transfer of a refrigerant from second branchselector unit 220 to refrigerant flow controlling condensing unit 105.Illustratively, second branch selector unit 220 may be directly orindirectly connected to refrigerant flow controlling condensing unit 105by gas and suction line 206, suction line 207, and liquid line 208. Inone or more embodiments, second branch selector unit 220 may beconnected to gas and suction line 206 at gas and suction line junction216, e.g., second branch selector unit 220 may be connected to gas andsuction line junction 216 by a second branch selector unit gas andsuction line 221. Illustratively, second branch selector unit 220 may beconnected to suction line 207 at suction line junction 217, e.g., secondbranch selector unit 220 may be connected to suction line junction 217by a second branch selector unit suction line 222. In one or moreembodiments, second branch selector unit 220 may be connected to liquidline 208 at liquid line junction 218, e.g., second branch selector unit220 may be connected to liquid line junction 218 by a second branchselector unit liquid line 223. Illustratively, second branch selectorunit 220 may be configured to facilitate a transfer of a refrigerantfrom second branch selector unit 220 to fan coil unit 230. In one ormore embodiments, second branch selector unit 220 may be configured tofacilitate a transfer of a refrigerant from fan coil unit 230 to secondbranch selector unit 220. Illustratively, second branch selector unit220 may be configured to facilitate a transfer of a refrigerant fromrefrigerant flow controlling condensing unit 105 to fan coil unit 230.In one or more embodiments, second branch selector unit 220 may beconfigured to facilitate a transfer of a refrigerant from fan coil unit230 to refrigerant flow controlling condensing unit 105.

Illustratively, first branch selector unit 210 and second branchselector unit 220 may comprise a single branch selector unit, e.g.,first branch selector unit 210 and second branch selector unit 220 maycomprise a multi-port branch selector. In one or more embodiments, firstbranch selector unit 210 and second branch selector unit 220 maycomprise independent multi-port branch selectors, e.g., first branchselector unit 210 may comprise a first multi-port branch selector andsecond branch selector unit 220 may comprise a second multi-port branchselector. Illustratively, first branch selector unit 210 and secondbranch selector unit 220 may comprise a single branch circuitcontroller. In one or more embodiments, first branch selector unit 210and second branch selector unit 220 may comprise independent branchcircuit controllers, e.g., first branch selector unit 210 may comprise afirst branch circuit controller and second branch selector unit 220 maycomprise a second branch circuit controller. Illustratively, firstbranch selector unit 210 and second branch selector unit 220 maycomprise a single branch selector box. In one or more embodiments, firstbranch selector unit 210 and second branch selector unit 220 maycomprise independent branch selector boxes, e.g., first branch selectorunit 210 may comprise a first branch selector box and second branchselector unit 220 may comprise a second branch selector box.

Illustratively, high efficiency ventilation system in a heat recoveryconfiguration 200 may be configured to ventilate controlled environment115 by supplying air at a controlled temperature and humidity via supplyair stream 142. In one or more embodiments, high efficiency ventilationsystem in a heat recovery configuration 200 may be configured toventilate controlled environment 115 by exhausting air via exhaust airstream 144. Illustratively, high efficiency ventilation system in a heatrecovery configuration 200 may be configured to control a temperature ofcontrolled environment 115, e.g., fan coil unit 230 may be configured toincrease or decrease a temperature of controlled environment 115. Duringsummer conditions, fan coil unit 230 may be configured to decrease atemperature of controlled environment 115. During winter conditions, fancoil unit 230 may be configured to increase a temperature of controlledenvironment 115. In one or more embodiments, direct expansion coil 110may be configured to increase a temperature of outside air stream 141and fan coil unit 230 may be configured to simultaneously increase atemperature of controlled environment 115. Illustratively, directexpansion coil 110 may be configured to increase a temperature ofoutside air stream 141 and fan coil unit 230 may be configured tosimultaneously decrease a temperature of cons trolled environment 115.In one or more embodiments, direct expansion coil 110 may be configuredto decrease a temperature of outside air stream 141 and fan coil unit230 may be configured to simultaneously decrease a temperature ofcontrolled environment 115. Illustratively, direct expansion coil 110may be configured to decrease a temperature of outside air stream 141and fan coil unit 230 may be configured to simultaneously increase atemperature of controlled environment 115.

In one or more embodiments, refrigerant flow controlling condensing unit105 may be directly or indirectly connected to a plurality of fan coilunits 230, e.g., refrigerant flow controlling condensing unit 105 may beconnected to a plurality of second branch selector units 220 whereineach second branch selector unit 220 of the plurality of second branchselector units 220 may be connected to a fan coil unit 230.Illustratively, refrigerant flow controlling condensing unit 105 may bedirectly or indirectly connected to a plurality of fan coil units 230wherein each fan coil unit 230 of the plurality of fan coil units 230may be configured to increase or decrease a temperature of controlledenvironment 115. For example, a first fan coil unit 230 may be disposedin a first zone of controlled environment 115 and a second fan coil unit230 may be disposed in a second zone of controlled environment 115. Inone or more embodiments, the first fan coil unit 230 may be configuredto increase or decrease a temperature of the first zone of controlledenvironment 115. Illustratively, the second fan coil unit 230 may beconfigured to increase or decrease a temperature of the second zone ofcontrolled environment 115. In one or more embodiments, the first fancoil unit 230 may be configured to increase a temperature of the firstzone of controlled environment 115 and the second fan coil unit 230 maybe configured to simultaneously increase a temperature of the secondzone of controlled environment 115. Illustratively, the first fan coilunit 230 may be configured to increase a temperature of the first zoneof controlled environment 115 and the second fan coil unit 230 may beconfigured to simultaneously decrease a temperature of the second zoneof controlled environment 115. In one or more embodiments, the first fancoil unit 230 may be configured to decrease a temperature of the firstzone of controlled environment 115 and the second fan coil unit 230 maybe configured to simultaneously decrease a temperature of the secondzone of controlled environment 115. Illustratively, the first fan coilunit 230 may be configured to decrease a temperature of the first zoneof controlled environment 115 and the second fan coil unit 230 may beconfigured to simultaneously increase a temperature of the second zoneof controlled environment 115. In one or more embodiments, highefficiency ventilation system in a heat recovery configuration 200 maybe configured to recover energy from a first fan coil unit 230 operatingin first mode of operation to improve an operating efficiency of asecond fan coil unit 230 operating in a second mode of operation.Illustratively, high efficiency ventilation system in a heat recoveryconfiguration 200 may be configured to increase an operating efficiencyin a range of 10.0 to 150.0 percent, e.g., high efficiency ventilationsystem in a heat recovery configuration 200 may be configured toincrease an operating efficiency by 98.0 percent. In one or moreembodiments, high efficiency ventilation system in a heat recoveryconfiguration 200 may be configured to increase an operating efficiencyby less than 10.0 percent or greater than 150.0 percent.

Illustratively, high efficiency ventilation system in a heat recoveryconfiguration 200 may improve an operating efficiency by increasing anIntegrated Energy Efficiency Ratio value in a range of 2.0 to 10.0,e.g., high efficiency ventilation system in a heat recoveryconfiguration 200 may increase an Integrated Energy Efficiency Ratiovalue by 8.0. In one or more embodiments, high efficiency ventilationsystem in a heat recovery configuration 200 may improve an operatingefficiency by increasing an Integrated Energy Efficiency Ratio value byless than 2.0 or by more than 10.0. Illustratively, high efficiencyventilation system in a heat recovery configuration 200 may improve anoperating efficiency by increasing a Coefficient of Performance value ina range of 1.2 to 10.0, e.g., high efficiency ventilation system in aheat recovery configuration 200 may improve an operating efficiency byincreasing a Coefficient of Performance value by 8.0. In one or moreembodiments, high efficiency ventilation system in a heat recoveryconfiguration 200 may improve an operating efficiency by increasing aCoefficient of Performance by less than 1.2 or by more than 10.0.Illustratively, a first fan coil unit 230 may be operating in a coolingmode, e.g., the first fan coil unit 230 may be configured to decrease atemperature of a first zone of controlled environment 115 by removingheat from the first zone of controlled environment 115. In one or moreembodiments, a second fan coil unit 230 may be operating in a heatingmode, e.g., the second fan coil unit 230 may be configured to increase atemperature of a second zone of controlled environment 115 by supplyingheat to the second zone of controlled environment 115. Illustratively,high efficiency ventilation system in a heat recovery configuration 200may be configured to recover energy by transferring heat removed fromthe first zone of controlled environment 115 to the second zone ofcontrolled environment 115, e.g., high efficiency ventilation system ina heat recovery configuration 200 may be configured to supply heatremoved from the first zone of controlled environment 115 to the secondzone of controlled environment 115. In one or more embodiments, highefficiency ventilation system in a heat recovery configuration 200 maybe configured to recover energy from a first fan coil unit 230 operatingin first mode of operation to improve an operating efficiency of aplurality of fan coil units 230 operating in a second mode of operation.Illustratively, a first fan coil unit 230 may be operating in a coolingmode, e.g., the first fan coil unit 230 may be configured to decrease atemperature of a first zone of controlled environment 115 by removingheat from the first zone of controlled environment 115. In one or moreembodiments, a plurality of fan coil units 230 may be operating in aheating mode, e.g., a plurality of fan coil units 230 may be configuredto increase a temperature of a plurality of zones of controlledenvironment 115 by supplying heat to the plurality of zones ofcontrolled environment 115. Illustratively, high efficiency ventilationsystem in a heat recovery configuration 200 may be configured to recoverenergy by transferring heat removed from the first zone of controlledenvironment 115 to the plurality of zones of controlled environment 115,e.g., high efficiency ventilation system in a heat recoveryconfiguration 200 may be configured to supply heat removed from thefirst zone of controlled environment 115 to the plurality of zones ofcontrolled environment 115. In one or more embodiments, high efficiencyventilation system in a heat recovery configuration 200 may beconfigured to uniformly transfer heat removed from the first zone ofcontrolled environment 115 to the plurality of zones of controlledenvironment 115, e.g., heat removed from the first zone of controlledenvironment 115 may be distributed wherein each zone of the plurality ofzones of controlled environment 115 receives an equal amount of heatremoved from the first zone of controlled environment 115.Illustratively, high efficiency ventilation system in a heat recoveryconfiguration 200 may be configured to selectively transfer heat removedfrom the first zone of controlled environment 115 to the plurality ofzones of controlled environment 115, e.g., heat removed from the firstzone of controlled environment 115 may be distributed to the pluralityof zones of controlled environment 115 in accordance with one or moredistribution variables. In one or more embodiments, distributionvariables may comprise information about a particular zone of theplurality of zones of controlled environment 115, e.g., distributionvariables may comprise a temperature of the particular zone of theplurality of zones of controlled environment 115. Illustratively,distribution variables may comprise information about a particular fancoil unit 230 of a plurality of fan coil units 230, e.g., distributionvariables may comprise a temperature control efficiency of theparticular fan coil unit 230 of the plurality of fan coil units 230.

In one or more embodiments, high efficiency ventilation system in a heatrecovery configuration 200 may be configured to recover energy from fancoil unit 230 to improve an operating efficiency of direct expansioncoil 110. Illustratively, high efficiency ventilation system in a heatrecovery configuration 200 may be configured to recover energy fromdirect expansion coil 110 to improve an operating efficiency of fan coilunit 230. In one or more embodiments, a first fan coil unit 230 may beoperating in a cooling mode, e.g., the first fan coil unit 230 may beconfigured to decrease a temperature of a first zone of controlledenvironment 115 by removing heat from the first zone of controlledenvironment 115. Illustratively, direct expansion coil 110 may beoperating in a heating mode, e.g., direct expansion coil 110 may beconfigured to increase a temperature of outside air stream 141 bysupplying heat to outside air stream 141. In one or more embodiments,high efficiency ventilation system in a heat recovery configuration 200may be configured to recover energy by transferring heat removed fromthe first zone of controlled environment 115 to outside air stream 141,e.g., high efficiency ventilation system in a heat recoveryconfiguration 200 may be configured to supply heat removed from thefirst zone of controlled environment 115 to outside air stream 141.Illustratively, direct expansion coil 110 may be operating in a coolingmode, e.g., direct expansion coil 110 may be configured to decrease atemperature of outside air stream 141 by removing heat from outside airstream 141. In one or more embodiments, a first fan coil unit 230 may beoperating in a heating mode, e.g., the first fan coil unit 230 may beconfigured to increase a temperature of a first zone of controlledenvironment 115 by supplying heat to the first zone of controlledenvironment 115. Illustratively, high efficiency ventilation system in aheat recovery configuration 200 may be configured to recover energy bytransferring heat removed from the outside air stream 141 to the firstzone of controlled environment 115, e.g., high efficiency ventilationsystem in a heat recovery configuration 200 may be configured to supplyheat removed from outside air stream 141 to the first zone of controlledenvironment 115.

In one or more embodiments, direct expansion coil 110 may be operatingin a cooling mode, e.g., direct expansion coil 110 may be configured todecrease a temperature of outside air stream 141 by removing heat fromoutside air stream 141. Illustratively, a plurality of fan coil units230 may be operating in a heating mode, e.g., a plurality of fan coilunits 230 may be configured to increase a temperature of a plurality ofzones of controlled environment 115 by supplying heat to the pluralityof zones of controlled environment 115. In one or more embodiments, highefficiency ventilation system in a heat recovery configuration 200 maybe configured to recover energy by transferring heat removed fromoutside air stream 141 to the plurality of zones of controlledenvironment 115, e.g., high efficiency ventilation system in a heatrecovery configuration 200 may be configured to supply heat removed fromoutside air stream 141 to the plurality of zones of controlledenvironment 115. Illustratively, high efficiency ventilation system in aheat recovery configuration 200 may be configured to uniformly transferheat removed from outside air stream 141 to the plurality of zones ofcontrolled environment 115, e.g., heat removed from outside air stream141 may be distributed wherein each zone of the plurality of zones ofcontrolled environment 115 receives an equal amount of heat removed fromoutside air stream 141. In one or more embodiments, high efficiencyventilation system in a heat recovery configuration 200 may beconfigured to selectively transfer heat removed from outside air stream141 to the plurality of zones of controlled environment 115, e.g., heatremoved from outside air stream 141 may be distributed to the pluralityof zones of controlled environment 115 in accordance with one or moredistribution variables. Illustratively, distribution variables maycomprise information about a particular zone of the plurality of zonesof controlled environment 115, e.g., distribution variables may comprisea temperature of the particular zone of the plurality of zones ofcontrolled environment 115. In one or more embodiments, distributionvariables may comprise information about a particular fan coil unit 230of a plurality of fan coil units 230, e.g., distribution variables maycomprise a temperature control efficiency of the particular fan coilunit 230 of the plurality of fan coil units 230.

FIG. 3 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary coil in outside air stream 300. Illustratively,high efficiency ventilation system with an auxiliary coil in outside airstream 300 may comprise a refrigerant flow controlling condensing unit105, a first branch selector unit 210, a second branch selector unit220, a third branch selector unit 330, a direct expansion coil 110, afan coil unit 230, a bypass mechanism 305, and an auxiliary directexpansion coil 310. In one or more embodiments, first branch selectorunit 210 may be disposed between direct expansion coil 110 andrefrigerant flow controlling condensing unit 105. Illustratively, firstbranch selector unit 210 may be directly or indirectly connected todirect expansion coil 110 by liquid line 106 and gas and suction line107. In one or more embodiments, refrigerant flow controlling condensingunit 105 may be configured to facilitate a transfer of a refrigerantfrom refrigerant flow controlling condensing unit 105 to first branchselector unit 210. Illustratively, refrigerant flow controllingcondensing unit 105 may be configured to facilitate a transfer of arefrigerant from first branch selector unit 210 to refrigerant flowcontrolling condensing unit 105. In one or more embodiments, firstbranch selector unit 210 may be directly or indirectly connected torefrigerant flow controlling condensing unit 105 by a gas and suctionline 206, a suction line 207, and a liquid line 208. Illustratively,first branch selector unit 210 may be connected to gas and suction line206 at a gas and suction line junction 216, e.g., first branch selectorunit 210 may be connected to gas and suction line junction 216 by afirst branch selector unit gas and suction line 211. In one or moreembodiments, first branch selector unit 210 may be connected to suctionline 207 at a suction line junction 217, e.g., first branch selectorunit 210 may be connected to suction line junction 217 by a first branchselector unit suction line 212. Illustratively, first branch selectorunit 210 may be connected to liquid line 208 at a liquid line junction218, e.g., first branch selector unit 210 may be connected to liquidline junction 218 by a first branch selector unit liquid line 213. Inone or more embodiments, first branch selector unit 210 may beconfigured to facilitate a transfer of a refrigerant from first branchselector unit 210 to direct expansion coil 110. Illustratively, firstbranch selector unit 210 may be configured to facilitate a transfer of arefrigerant from direct expansion coil 110 to first branch selector unit210. In one or more embodiments, first branch selector unit 210 may beconfigured to facilitate a transfer of a refrigerant from refrigerantflow controlling condensing unit 105 to direct expansion coil 110.Illustratively, first branch selector unit 210 may be configured tofacilitate a transfer of a refrigerant from direct expansion coil 110 torefrigerant flow controlling condensing unit 105.

In one or more embodiments, second branch selector unit 220 may bedisposed between refrigerant flow controlling condensing unit 105 andfan coil unit 230. Illustratively, second branch selector unit 220 maybe directly or indirectly connected to fan coil unit 230 by fan coilliquid line 226 and fan coil gas and suction line 227. In one or moreembodiments, refrigerant flow controlling condensing unit 105 may beconfigured to facilitate a transfer of a refrigerant from refrigerantflow controlling condensing unit 105 to second branch selector unit 220.Illustratively, refrigerant flow controlling condensing unit 105 may beconfigured to facilitate a transfer of a refrigerant from second branchselector unit 220 to refrigerant flow controlling condensing unit 105.In one or more embodiments, second branch selector unit 220 may bedirectly or indirectly connected to refrigerant flow controllingcondensing unit 105 by gas and suction line 206, suction line 207, andliquid line 208. Illustratively, second branch selector unit 220 may beconnected to gas and suction line 206 at gas and suction line junction316, e.g., second branch selector unit 220 may be connected to gas andsuction line junction 316 by a second branch selector unit gas andsuction line 221. For example, gas and suction line junction 316 maycomprise a Refnet joint. In one or more embodiments, second branchselector unit 220 may be connected to suction line 207 at suction linejunction 317, e.g., second branch selector unit 220 may be connected tosuction line junction 317 by a second branch selector unit suction line222. For example, suction line junction 317 may comprise a Refnet joint.Illustratively, second branch selector unit 220 may be connected toliquid line 208 at liquid line junction 318, e.g., second branchselector unit 220 may be connected to liquid line junction 318 by asecond branch selector unit liquid line 223. For example, liquid linejunction 318 may comprise a Refnet joint. In one or more embodiments,second branch selector unit 220 may be configured to facilitate atransfer of a refrigerant from second branch selector unit 220 to fancoil unit 230. Illustratively, second branch selector unit 220 may beconfigured to facilitate a transfer of a refrigerant from fan coil unit230 to second branch selector unit 220. In one or more embodiments,second branch selector unit 220 may be configured to facilitate atransfer of a refrigerant from refrigerant flow controlling condensingunit 105 to fan coil unit 230. Illustratively, second branch selectorunit 220 may be configured to facilitate a transfer of a refrigerantfrom fan coil unit 230 to refrigerant flow controlling condensing unit105.

In one or more embodiments, third branch selector unit 330 may bedisposed between auxiliary direct expansion coil 310 and refrigerantflow controlling condensing unit 105. Illustratively, third branchselector unit 330 may be directly or indirectly connected to auxiliarydirect expansion coil 310 by liquid line 306 and gas and suction line307. In one or more embodiments, refrigerant flow controlling condensingunit 105 may be configured to facilitate a transfer of a refrigerantfrom refrigerant flow controlling condensing unit 105 to third branchselector unit 330. Illustratively, refrigerant flow controllingcondensing unit 105 may be configured to facilitate a transfer of arefrigerant from third branch selector unit 330 to refrigerant flowcontrolling condensing unit 105. In one or more embodiments, thirdbranch selector unit 330 may be directly or indirectly connected torefrigerant flow controlling condensing unit 105 by a gas and suctionline 206, a suction line 207, and a liquid line 208. Illustratively,third branch selector unit 330 may be connected to gas and suction line206 at a gas line junction, e.g., third branch selector unit 330 may beconnected to a gas line junction by a third branch selector unit gas andsuction line 331. In one or more embodiments, third branch selector unit330 may be connected to suction line 207 at a suction line junction,e.g., third branch selector unit 330 may be connected to a suction linejunction by a third branch selector unit suction line 332.Illustratively, third branch selector unit 330 may be connected toliquid line 208 at a liquid line junction, e.g., third branch selectorunit 330 may be connected to a liquid line junction 330 by a thirdbranch selector unit liquid line 333. In one or more embodiments, thirdbranch selector unit 330 may be configured to facilitate a transfer of arefrigerant from third branch selector unit 330 to auxiliary directexpansion coil 310. Illustratively, third branch selector unit 330 maybe configured to facilitate a transfer of a refrigerant from auxiliarydirect expansion coil 310 to third branch selector unit 330. In one ormore embodiments, third branch selector unit 330 may be configured tofacilitate a transfer of a refrigerant from refrigerant flow controllingcondensing unit 105 to auxiliary direct expansion coil 310.Illustratively, third branch selector unit 330 may be configured tofacilitate a transfer of a refrigerant from auxiliary direct expansioncoil 310 to refrigerant flow controlling condensing unit 105.

Illustratively, first branch selector unit 210, second branch selectorunit 220, and third branch selector unit 330 may comprise a singlebranch selector unit, e.g., first branch selector unit 210, secondbranch selector unit 220, and third branch selector unit 330 maycomprise a multi-port branch selector. In one or more embodiments, firstbranch selector unit 210, second branch selector unit 220, and thirdbranch selector unit 330 may comprise independent multi-port branchselectors, e.g., first branch selector unit 210 may comprise a firstmulti-port branch selector, second branch selector unit 220 may comprisea second multi-port branch selector, and third branch selector unit 330may comprise a third multi-port branch selector. Illustratively, firstbranch selector unit 210, second branch selector unit 220, and thirdbranch selector unit 330 may comprise a single branch circuitcontroller. In one or more embodiments, first branch selector unit 210,second branch selector unit 220, and third branch selector unit 330 maycomprise independent branch circuit controllers, e.g., first branchselector unit 210 may comprise a first branch circuit controller, secondbranch selector unit 220 may comprise a second branch circuitcontroller, and third branch selector unit 330 may comprise a thirdbranch circuit controller. Illustratively, first branch selector unit210, second branch selector unit 220, and third branch selector unit 330may comprise a single branch selector box. In one or more embodiments,first branch selector unit 210, second branch selector unit 220, andthird branch selector unit 330 may comprise independent branch selectorboxes, e.g., first branch selector unit 210 may comprise a first branchselector box, second branch selector unit 220 may comprise a secondbranch selector box, and third branch selector unit 330 may comprise athird branch selector box.

Illustratively, high efficiency ventilation system with an auxiliarycoil in outside air stream 300 may be configured to ventilate controlledenvironment 115 by supplying air at a controlled temperature andhumidity via supply air stream 142. In one or more embodiments, highefficiency ventilation system with an auxiliary coil in outside airstream 300 may be configured to ventilate controlled environment 115 byexhausting air via exhaust air stream 144. Illustratively, highefficiency ventilation system with an auxiliary coil in outside airstream 300 may be configured to control a temperature of controlledenvironment 115, e.g., fan coil unit 230 may be configured to increaseor decrease a temperature of controlled environment 115. During summerconditions, fan coil unit 230 may be configured to decrease atemperature of controlled environment 115. During winter conditions, fancoil unit 230 may be configured to increase a temperature of controlledenvironment 115. In one or more embodiments, direct expansion coil 110and auxiliary direct expansion coil 310 may be configured to increase atemperature of outside air stream 141 and fan coil unit 230 may beconfigured to simultaneously increase a temperature of controlledenvironment 115. Illustratively, direct expansion coil 110 and auxiliarydirect expansion coil 310 may be configured to increase a temperature ofoutside air stream 141 and fan coil unit 230 may be configured tosimultaneously decrease a temperature of controlled environment 115. Inone or more embodiments, direct expansion coil 110 may be configured toincrease a temperature of outside air stream 141 and fan coil unit 230may be configured to simultaneously decrease a temperature of controlledenvironment 115. Illustratively, direct expansion coil 110 may beconfigured to decrease a temperature of outside air stream 141 and fancoil unit 230 may be configured to simultaneously increase a temperatureof controlled environment 115. In one or more embodiments, highefficiency ventilation system with an auxiliary coil in outside airstream 300 may comprise a high efficiency ventilation system in a heatrecovery configuration 200. Illustratively, high efficiency ventilationsystem with an auxiliary coil in outside air stream 300 may beconfigured to recover energy from a first fan coil unit 230 operating ina first mode of operation to improve an operating efficiency of a secondfan coil unit 230 operating in a second mode of operation. In one ormore embodiments, high efficiency ventilation system with an auxiliarycoil in outside air stream 300 may be configured to recover energy fromone or more fan coil units 230 to improve an operating efficiency ofdirect expansion coil 110 or auxiliary direct expansion coil 310.Illustratively, high efficiency ventilation system with an auxiliarycoil in outside air stream 300 may be configured to recover energy fromdirect expansion coil 110 or auxiliary direct expansion coil 310 toimprove an operating efficiency of one or more fan coil units 230.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed within an eighth supply air zone 351, e.g., auxiliary directexpansion coil 310 may be configured to increase or decrease atemperature of air in eighth supply air zone 351. Illustratively,auxiliary direct expansion coil 310 may be configured to increase ordecrease a temperature of outside air stream 141. In one or moreembodiments, auxiliary direct expansion coil 310 may comprise aheating-only direct expansion coil 110, e.g., auxiliary direct expansioncoil 310 may be configured to increase a temperature of outside airstream 141. Illustratively, auxiliary direct expansion coil 310 may beconfigured to increase a temperature of outside air stream 141 during aperformance of a maintenance operation on refrigerant flow controllingcondensing unit 105. In one or more embodiments, a performance of amaintenance operation on refrigerant flow controlling condensing unit105 may temporarily reduce a heating capacity of direct expansion coil110, e.g., a performance of a maintenance operation on refrigerant flowcontrolling condensing unit 105 may temporarily reduce a heatingcapacity of direct expansion coil 110 by 50.0 percent. Illustratively,auxiliary direct expansion coil 310 may be configured to provide heatingcapacity to supplement a reduced heating capacity of direct expansioncoil 110, e.g., auxiliary direct expansion coil 310 may be configured toprovide heating capacity to supplement a reduced heating capacity ofdirect expansion coil 110 during a performance of a maintenanceoperation on refrigerant flow controlling condensing unit 105. In one ormore embodiments, direct expansion coil 110 may be configured toincrease a temperature of outside air stream 141, e.g., outside airstream 141 may ingress second supply air zone 151 at a firsttemperature. Illustratively, direct expansion coil 110 may be configuredto increase a temperature of air in third supply air zone 152, e.g.,outside air stream 141 may ingress fourth supply air zone 153 at asecond temperature. In one or more embodiments, the second temperatureof outside air stream 141 may be greater than the first temperature ofoutside air stream 141. Illustratively, heat recovery ventilator 125 maybe configured to increase a temperature of outside air stream 141, e.g.,outside air stream 141 may ingress seventh supply air zone 350 at athird temperature wherein the third temperature of outside air stream141 is greater than the second temperature of outside air stream 141. Inone or more embodiments, auxiliary direct expansion coil 310 may beconfigured to increase a temperature of outside air stream 141, e.g.,outs side air stream 141 may ingress sixth supply air zone 155 at afourth temperature wherein the fourth temperature of outside air stream141 is greater than the third temperature of outside air stream 141.Illustratively, heat recovery ventilator 125 may be in a standby mode,e.g., heat recovery ventilator 125 may be configured not to increase ordecrease a temperature of outside air stream 141. In one or moreembodiments, direct expansion coil 110 may be configured to increase atemperature of outside air stream 141, e.g., outside air stream 141 mayingress second supply air zone 151 at a first temperature and outsideair stream 141 may ingress fourth supply air zone 153 at a secondtemperature wherein the second temperature of outside air stream 141 maybe greater than the first temperature of outside air stream 141.Illustratively, outside air stream 141 may ingress seventh supply airzone 350 at the second temperature, e.g., outside air stream 141 mayingress seventh supply air zone 350 at the second temperature when heatrecovery ventilator 125 is in a standby mode.

In one or more embodiments, auxiliary direct expansion coil 310 may beconfigured to increase a temperature of outside air stream 141, e.g.,outside air stream 141 may ingress sixth supply air zone 155 at a thirdtemperature wherein the third temperature of outside air stream 141 isgreater than the second temperature of outside air stream 141.Illustratively, auxiliary direct expansion coil 310 may be configured toprovide heating capacity during a defrost operation, e.g., auxiliarydirect expansion coil 310 may be configured to provide heating capacityduring a defrost operation to defrost direct expansion coil 110. In oneor more embodiments, auxiliary direct expansion coil 310 may beconfigured to provide heating capacity during a defrost operation todefrost energy recovery ventilator 120. Illustratively, auxiliary directexpansion coil 310 may be configured to increase a temperature ofoutside air stream 141 during a defrost operation to defrost directexpansion coil 110. In one or more embodiments, auxiliary directexpansion coil 310 may be configured to increase a temperature ofoutside air stream 141 during a defrost operation to defrost energyrecovery ventilator 120. Illustratively, auxiliary direct expansion coil310 may be configured to increase a temperature of return air stream143, e.g., auxiliary direct expansion coil 310 may be configured toincrease a temperature of return air stream 143 during a defrostoperation. In one or more embodiments, bypass mechanism 305 may beconfigured to mechanically control air flow within high efficiencyventilation system with an auxiliary coil in outside air stream 300.Illustratively, bypass mechanism 305 may be configured to direct airflow out from one or more supply air zones and into one or more returnair zones. In one or more embodiments, bypass mechanism 305 may beconfigured to direct air flow out from one or more return air zones andinto one or more supply air zones. Illustratively, bypass mechanism 305may be configured to direct return air stream 143 out from a fifthreturn air zone 360 and into seventh supply air zone 350, e.g., bypassmechanism 305 may be configured to prevent an ingress of return airstream 143 into second return air zone 161. In one or more embodiments,bypass mechanism 305 may be configured to facilitate an ingress ofreturn air stream 143 into seventh supply air zone 350. Illustratively,bypass mechanism 305 may be configured to facilitate an ingress ofreturn air stream 143 into fourth supply air zone 153, e.g., bypassmechanism 305 may be configured to facilitate an ingress of return airstream 143 into fourth supply air zone 153 during a defrost operation todefrost direct expansion coil 110. In one or more embodiments, bypassmechanism 305 may be configured to facilitate an ingress of return airstream 143 into third supply air zone 152, e.g., bypass mechanism 305may be configured to facilitate an ingress of return air stream 143 intothird supply air zone 152 during a defrost operation to defrost directexpansion coil 110. Illustratively, air supplier 135 may be configuredto facilitate an ingress of return air stream 143 into third supply airzone 152 during a defrost operation to defrost direct expansion coil110, e.g., air supplier 135 may be temporarily reversed to facilitate aningress of return air stream 143 into third supply air zone 152.

In one or more embodiments, auxiliary direct expansion coil 310 may beconfigured to increase a temperature of return air stream 143 during adefrost operation to defrost direct expansion coil 110, e.g., auxiliarydirect expansion coil 310 may be configured to increase a temperature ofseventh supply air zone 350. Illustratively, return air stream 143 mayingress fifth return air zone 360 at a first temperature, e.g., thefirst temperature may be greater than a temperature of air within thirdsupply air zone 152. In one or more embodiments, bypass mechanism 305may be configured to direct return air stream 143 out from fifth returnair zone 360 and into seventh supply air zone 350. Illustratively,return air stream 143 may ingress seventh supply air zone 350 at thefirst temperature. In one or more embodiments, auxiliary directexpansion coil 310 may be cons figured to increase a temperature ofreturn air stream 143 in seventh supply air zone 350. Illustratively,return air stream 143 may egress seventh supply air zone 350 at a secondtemperature wherein the second temperature of return air stream 143 isgreater than the first temperature of return air stream 143. In one ormore embodiments, return air stream 143 may ingress fourth supply airzone 153 at the second temperature, e.g., return air stream 143 mayingress fourth supply air zone 153 at the second temperature during adefrost operation to defrost direct expansion coil 110.

In one or more embodiments, auxiliary direct expansion coil 310 may beconfigured to increase a temperature of return air stream 143 during adefrost operation to defrost energy recovery ventilator 120, e.g.,auxiliary direct expansion coil 310 may be configured to increase atemperature of seventh supply air zone 350. Illustratively, return airstream 143 may ingress fifth return air zone 360 at a first temperature,e.g., the first temperature may be greater than a temperature of outsideair stream 141. In one or more embodiments, bypass mechanism 305 may beconfigured to direct return air stream 143 out from fifth return airzone 360 and into seventh supply air zone 350. Illustratively, returnair stream 143 may ingress seventh supply air zone 350 at the firsttemperature. In one or more embodiments, auxiliary direct expansion coil310 may be configured to increase a temperature of return air stream 143in seventh supply air zone 350. Illustratively, return air stream 143may egress seventh supply air zone 350 at a second temperature whereinthe second temperature of return air stream 143 is greater than thefirst temperature of return air stream 143. In one or more embodiments,return air stream 143 may ingress fourth supply air zone 153 at thesecond temperature. Illustratively, direct expansion coil 110 may beconfigured to increase a temperature of return air stream 143. In one ormore embodiments, return air stream 143 may ingress second supply airzone 151 at a third temperature wherein the third temperature of returnair stream 143 is greater than the second temperature of return airstream 143. Illustratively, return air stream 143 may ingress secondsupply air zone 151 at the third temperature during a defrost operationto defrost energy recovery ventilator 120.

Illustratively, bypass mechanism 305 may be configured to direct outsideair stream 141 out from seventh supply air zone 350 and into fifthreturn air zone 360, e.g., bypass mechanism 305 may be configured tofacilitate an ingress of outside air stream 141 into fifth return airzone 360 during a defrost operation to defrost energy recoveryventilator 120. In one or more embodiments, outside air stream 141 mayingress seventh supply air zone 350 at a first temperature.Illustratively, auxiliary direct expansion coil 310 may be configured toincrease a temperature of outside air stream 141. In one or moreembodiments, outside air stream 141 may egress seventh supply air zone350 at a second temperature wherein the second temperature of outsideair stream 141 is greater than the first temperature of outside airstream 141. Illustratively, outside air stream 141 may ingress fifthreturn air zone 360 at the second temperature. In one or moreembodiments, outside air stream 141 may ingress second return air zone161 at the second temperature during a defrost operation to defrostenergy recovery ventilator 120. Illustratively, high efficiencyventilation system with an auxiliary coil in outside air stream 300 maybe configured to simultaneously defrost energy recovery ventilator onboth sides of partition 111, e.g., direct expansion coil 110 may beconfigured to defrost energy recovery ventilator 120 in second supplyair zone 151 and auxiliary direct expansion coil 310 may be configuredto defrost energy recovery ventilator 120 in second return air zone 161.

In one or more embodiments, high efficiency ventilation system with anauxiliary coil in outside air stream 300 may be configured to decrease atemperature of outside air stream 141 to improve cooling efficiency.Illustratively, high efficiency ventilation system with an auxiliarycoil in outside air stream 300 may be configured to decrease atemperature of return air stream 143 to improve cooling efficiency. Inone or more embodiments, outside air stream 141 may ingress secondsupply air zone 151 at a first temperature. Illustratively, directexpansion coil 110 may be configured to decrease a temperature ofoutside air stream 141, e.g., outside air stream 141 may ingress fourthsupply air zone 153 at a second temperature wherein the secondtemperature of outside air stream 141 is less than the first temperatureof outside air stream 141. In one or more embodiments, outside airstream 141 may ingress seventh supply air zone 350 at the secondtemperature. Illustratively, auxiliary direct expansion coil 310 may beconfigured to decrease a temperature of outside air stream 141, e.g.,outside air stream 141 my ingress sixth supply air zone 155 at a thirdtemperature wherein the third temperature of outside air stream 141 isless than the second temperature of outside air stream 141.

In one or more embodiments, auxiliary direct expansion coil 310 may beconfigured to decrease a temperature of return air stream 143 todecrease a temperature of outside air stream 141 in second supply airzone 151. Illustratively, energy recovery ventilator 120 may beconfigured to improve cooling efficiency of high efficiency ventilationsystem with an auxiliary coil in outside air stream 300 by removing heatfrom outside air stream 141. In one or more embodiments, energy recoveryventilator 120 may be configured to transfer heat from outside airstream 141 to return air stream 143. Illustratively, auxiliary directexpansion coil 310 may be configured to decrease a temperature of returnair stream 143 to increase an amount of heat that energy recoveryventilator 120 is configured to remove from outside air stream 141. Inone or more embodiments, return air stream 143 may ingress first returnair zone 160 at a first temperature wherein the first temperature islower than a temperature of outside air stream 141. Illustratively,auxiliary direct expansion coil 310 may be configured to decrease atemperature of return air stream 143, e.g., bypass mechanism 305 may beconfigured to facilitate a decrease in a temperature of fifth return airzone 360. In one or more embodiments, auxiliary direct expansion coil310 may be configured to decrease a temperature of return air stream143, e.g., return air stream 143 may ingress second return air zone 161at a second temperature wherein the second temperature of return airstream 143 is less than the first temperature of return air stream 143.Illustratively, energy recovery ventilator 120 may be configured totransfer more heat from outside air stream 141 to a return air stream143 at the second temperature than a return air stream 143 at the firsttemperature. In one or more embodiments, outside air stream 141 mayingress second supply air zone 151 at a lower temperature if return airstream 143 ingresses second return air zone 161 at the secondtemperature than if return air stream 143 ingresses second return airzone 161 at the first temperature.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in first supply air zone 150, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin first supply air zone 150. Illustratively, outside air stream 141 mayingress first supply air zone 150 at a first temperature and outside airstream 141 may egress first supply air zone 150 at a second temperature,e.g., outside air stream 141 may ingress second supply air zone 151 atthe second temperature. In one or more embodiments, the secondtemperature of outside air stream 141 may be greater than the firsttemperature of outside air stream 141, e.g., auxiliary direct expansioncoil 310 may be configured to operate in a heating mode within firstsupply air zone 150. Illustratively, the second temperature of outsideair stream 141 may be less than the first temperature of outside airstream 141, e.g., auxiliary direct expansion coil 310 may be configuredto operate in a cooling mode within first supply air zone 150.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in second supply air zone 151, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin second supply air zone 151. Illustratively, outside air stream 141may ingress second supply air zone 151 at a first temperature andoutside air stream 141 may egress second supply air zone 151 at a secondtemperature, e.g., outside air stream 141 may ingress third supply airzone 152 at the second temperature. In one or more embodiments, thesecond temperature of outside air stream 141 may be greater than thefirst temperature of outside air stream 141, e.g., auxiliary directexpansion coil 310 may be configured to operate in a heating mode withinsecond supply air zone 151. Illustratively, the second temperature ofoutside air stream 141 may be less than the first temperature of outsideair stream 141, e.g., auxiliary direct expansion coil 310 may beconfigured to operate in a cooling mode within second supply air zone151.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in fourth supply air zone 153, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin fourth supply air zone 153. Illustratively, outside air stream 141may ingress fourth supply air zone 153 at a first temperature andoutside air stream 141 may egress fourth supply air zone 153 at a secondtemperature, e.g., outside air stream 141 may ingress seventh supply airzone 350 at the second temperature. In one or more embodiments, thesecond temperature of outside air stream 141 may be greater than thefirst temperature of outside air stream 141, e.g., auxiliary directexpansion coil 310 may be configured to operate in a heating mode withinfourth supply air zone 153. Illustratively, the second temperature ofoutside air stream 141 may be less than the first temperature of outsideair stream 141, e.g., auxiliary direct expansion coil 310 may beconfigured to operate in a cooling mode within fourth supply air zone153.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in seventh supply air zone 350, e.g., auxiliary directexpansion coil 310 may be configured to increase or decrease atemperature of air in seventh supply air zone 350. Illustratively,outside air stream 141 may ingress seventh supply air zone 350 at afirst temperature and outside air stream 141 may egress seventh supplyair zone 350 at a second temperature, e.g., outside air stream 141 mayingress eighth supply air zone 351 at the second temperature. In one ormore embodiments, the second temperature of outside air stream 141 maybe greater than the first temperature of outside air stream 141, e.g.,auxiliary direct expansion coil 310 may be configured to operate in aheating mode within seventh supply air zone 350. Illustratively, thesecond temperature of outside air stream 141 may be less than the firsttemperature of outside air stream 141, e.g., auxiliary direct expansioncoil 310 may be configured to operate in a cooling mode within seventhsupply air zone 350.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in sixth supply air zone 155, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin sixth supply air zone 155. Illustratively, outside air stream 141 mayingress sixth supply air zone 155 at a first temperature and outside airstream 141 may egress sixth supply air zone 155 at a second temperature,e.g., outside air stream 141 may ingress controlled environment 115 atthe second temperature as supply air stream 142. In one or moreembodiments, the second temperature of outside air stream 141 may begreater than the first temperature of outside air stream 141, e.g.,auxiliary direct expansion coil 310 may be configured to operate in aheating mode within sixth supply air zone 155. Illustratively, thesecond temperature of outside air stream 141 may be less than the firsttemperature of outside air stream 141, e.g., auxiliary direct expansioncoil 310 may be configured to operate in a cooling mode within sixthsupply air zone 155.

In one or more embodiments, high efficiency ventilation system with anauxiliary coil in outside air stream 300 may comprise a high efficiencyventilation system in a heat pump configuration 100. Illustratively,direct expansion coil 110 may be directly or indirectly connected to afirst refrigerant flow controlling condensing unit 105, e.g., directexpansion coil 110 and a first refrigerant flow controlling condensingunit 105 be configured to operate in a heat pump configuration or a heatrecovery configuration. In one or more embodiments, auxiliary directexpansion coil 310 may be directly or indirectly connected to a secondrefrigerant flow controlling condensing unit 105, e.g., auxiliary directexpansion coil 310 and a second refrigerant flow controlling condensingunit 105 may be configured to operate in a heat pump configuration or aheat recovery configuration. Illustratively, direct expansion coil 110and a first refrigerant flow controlling condensing unit 105 may beconfigured to operate in a heat pump configuration and auxiliary directexpansion coil 310 and a second refrigerant flow controlling condensingunit 105 may be configured to simultaneously operate in a heat pumpconfiguration. In one or more embodiments, direct expansion coil 110 anda first refrigerant flow controlling condensing unit 105 may beconfigured to operate in a heat recovery configuration and auxiliarydirect expansion coil 310 and a second refrigerant flow controllingcondensing unit 105 may be configured to simultaneously operate in aheat recovery configuration. Illustratively, direct expansion coil 110and a first refrigerant flow controlling condensing unit 105 may beconfigured to operate in a heat recovery configuration and auxiliarydirect expansion coil 310 and a second refrigerant flow controllingcondensing unit 105 may be configured to simultaneously operate in aheat pump configuration. In one or more embodiments, direct expansioncoil 110 and a first refrigerant flow controlling condensing unit 105may be configured to operate in a heat pump configuration and auxiliarydirect expansion coil 310 and a second refrigerant flow controllingcondensing unit 105 may be configured to simultaneously operate in aheat recovery configuration.

FIG. 4 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary coil in return air stream 400. In one or moreembodiments, high efficiency ventilation system with an auxiliary coilin return air stream 400 may comprise may comprise a refrigerant flowcontrolling condensing unit 105, a first branch selector unit 210, asecond branch selector unit 220, a third branch selector unit 330, adirect expansion coil 110, a fan coil unit 230, a bypass mechanism 405,and an auxiliary direct expansion coil 310. Illustratively, highefficiency ventilation system with an auxiliary coil in return airstream 400 may be configured to ventilate controlled environment 115 bysupplying air at a controlled temperature and humidity via supply airstream 142. In one or more embodiments, high efficiency ventilationsystem with an auxiliary coil in return air stream 400 may be configuredto ventilate controlled environment 115 by exhausting air via exhaustair stream 144. Illustratively, high efficiency ventilation system withan auxiliary coil in return air stream 400 may be configured to controla temperature of controlled environment 115, e.g., fan coil unit 230 maybe configured to increase or decrease a temperature of controlledenvironment 115. During summer conditions, fan coil unit 230 may beconfigured to decrease a temperature of controlled environment 115.During winter conditions, fan coil unit 230 may be configured toincrease a temperature of controlled environment 115. In one or moreembodiments, direct expansion coil 110 and auxiliary direct expansioncoil 310 may be configured to increase a temperature of outside airstream 141 and fan coil unit 230 may be configured to simultaneouslyincrease a temperature of controlled environment 115. Illustratively,direct expansion coil 110 and auxiliary direct expansion coil 310 may beconfigured to increase a temperature of outside air stream 141 and fancoil unit 230 may be configured to simultaneously decrease a temperatureof controlled environment 115. In one or more embodiments, directexpansion coil 110 may be configured to decrease a temperature ofoutside air stream 141 and fan coil unit 230 may be configured tosimultaneously decrease a temperature of controlled environment 115.Illustratively, direct expansion coil 110 may be configured to decreasea temperature of outside air stream 141 and fan coil unit 230 may beconfigured to simultaneously increase a temperature of controlledenvironment 115. In one or more embodiments, high efficiency ventilationsystem with an auxiliary coil in return air stream 400 may comprise ahigh efficiency ventilation system in a heat recovery configuration 200.Illustratively, high efficiency ventilation system with an auxiliarycoil in return air stream 400 may be configured to recover energy from afirst fan coil unit 230 operating in a first mode of operation toimprove an operating efficiency of a second fan coil unit 230 operatingin a second mode of operation. In one or more embodiments, highefficiency ventilation system with an auxiliary coil in return airstream 400 may be configured to recover energy from one or more fan coilunits 230 to improve an operating efficiency of direct expansion coil110 or auxiliary direct expansion coil 310. Illustratively, highefficiency ventilation system with an auxiliary coil in return airstream 400 may be configured to recover energy from direct expansioncoil 110 or auxiliary direct expansion coil 310 to improve an operatingefficiency of one or more fan coil units 230.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed within a sixth return air zone 460, e.g., auxiliary directexpansion coil 310 may be configured to increase or decrease atemperature of air in sixth return air zone 460. Illustratively,auxiliary direct expansion coil 310 may be configured to increase ordecrease a temperature of return air stream 143. In one or moreembodiments, auxiliary direct expansion coil 310 may comprise aheating-only direct expansion coil 110, e.g., auxiliary direct expansioncoil 310 may be configured to increase a temperature of return airstream 143. Illustratively, bypass mechanism 405 may be configured tomechanically control air flow within high efficiency ventilation systemwith an auxiliary coil in return air stream 400. In one or moreembodiments, bypass mechanism 405 may be configured to direct air flowout from one or more supply air zones and into one or more return airzones. Illustratively, bypass mechanism 405 may be configured to directair flow out from one or more return air zones and into one or moresupply air zones. In one or more embodiments, bypass mechanism 405 maybe configured to direct return air stream 143 out from a seventh returnair zone 461 and into a ninth supply air zone 450, e.g., bypassmechanism 405 may be configured to prevent an ingress of return airstream 143 into second return air zone 161. Illustratively, bypassmechanism 405 may be configured to facilitate an ingress of return airstream 143 into ninth supply air zone 450. In one or more embodiments,auxiliary direct expansion coil 310 may be configured to provide heatingcapacity to supplement a reduced heating capacity of direct expansioncoil 110 during a performance of a maintenance operation on refrigerantflow controlling condensing unit 105. Illustratively, auxiliary directexpansion coil 310 may be configured to increase a temperature ofoutside air stream 141 during a performance of a maintenance operationon refrigerant flow controlling condensing unit 105. In one or moreembodiments, return air stream 143 may ingress first return air zone 160at a first temperature. Illustratively, auxiliary direct expansion coil310 may be configured to increase a temperature of air in sixth returnair zone 460. In one or more embodiments, return air stream 143 mayingress seventh return air zone 461 at a second temperature wherein thesecond temperature of return air stream 143 is greater than the firsttemperature of return air stream 143. Illustratively, bypass mechanism405 may be configured to direct air at the second temperature out fromseventh return air zone 461 and into ninth supply air zone 450, e.g.,bypass mechanism 405 may be configured to direct air at the secondtemperature into ninth supply air zone 450 during a defrost operation todefrost direct expansion coil 110. In one or more embodiments, bypassmechanism 405 may be configured to direct air at the second temperatureinto ninth supply air zone 450 during a defrost operation to defrostenergy recovery ventilator 120. Illustratively, bypass mechanism 405 maybe configured to direct air at the second temperature into ninth supplyair zone 450 to supplement a reduced heating capacity of directexpansion coil 110. In one or more embodiments, outside air stream 141may ingress fourth supply air zone 153 at a third temperature.Illustratively, auxiliary direct expansion coil 310 may be configured toincrease a temperature of outside air stream 141, e.g., outside airstream 141 may ingress sixth supply air zone 155 at a fourth temperaturewherein the fourth temperature of outside air stream 141 is greater thanthe third temperature of outside air stream 141.

In one or more embodiments, auxiliary direct expansion coil 310 may beconfigured to increase a temperature of return air stream 143 during adefrost operation to defrost energy recovery ventilator 120.Illustratively, return air stream 143 may ingress first return air zone160 at a first temperature. In one or more embodiments, auxiliary directexpansion coil 310 may be configured to increase a temperature of air insixth return air zone 460. Illustratively, return air stream 143 mayingress seventh return air zone 461 at a second temperature wherein thesecond temperature of return air stream 143 is greater than the firsttemperature of return air stream 143. In one or more embodiments, returnair stream 143 may ingress second return air zone 161 at the secondtemperature, e.g., return air stream 143 may ingress second return airzone 161 at the second temperature during a defrost operation to defrostenergy recovery ventilator 120. Illustratively, direct expansion coil110 may be configured to simultaneously defrost energy recoveryventilator 120 during a defrost operation to defrost energy recoveryventilator 120.

In one or more embodiments, auxiliary direct expansion coil 310 may beconfigured to decrease a temperature of return air stream 143 todecrease a temperature of outside air stream 141 in second supply airzone 151. Illustratively, energy recovery ventilator 120 may beconfigured to improve cooling efficiency of high efficiency ventilationsystem with an auxiliary coil in return air stream 400 by removing heatfrom outside air stream 141. In one or more embodiments, energy recoveryventilator 120 may be configured to transfer heat from outside airstream 141 to return air stream 143. Illustratively, auxiliary directexpansion coil 310 may be configured to decrease a temperature of returnair stream 143 to increase an amount of heat that energy recoveryventilator 120 is configured to remove from outside air stream 141. Inone or more embodiments, return air stream 143 may ingress first returnair zone 160 at a first temperature wherein the first temperature islower than a temperature of outside air stream 141. Illustratively,auxiliary direct expansion coil 310 may be configured to decrease atemperature of return air stream 143. In one or more embodiments,auxiliary direct expansion coil 310 may be configured to decrease atemperature of return air stream 143, e.g., return air stream 143 mayingress second return air zone 161 at a second temperature wherein thesecond temperature of return air stream 143 is less than the firsttemperature of return air stream 143. Illustratively, energy recoveryventilator 120 may be configured to transfer more heat from outside airstream 141 to a return air stream 143 at the second temperature than areturn air stream 143 at the first temperature. In one or moreembodiments, outside air stream 141 may ingress second supply air zone151 at a lower temperature if return air stream 143 ingresses secondreturn air zone 161 at the second temperature than if return air stream143 ingresses second return air zone 161 at the first temperature.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in first return air zone 160, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin first return air zone 160. Illustratively, return air stream 143 mayingress first return air zone 160 at a first temperature and return airstream 143 may egress first return air zone 160 at a second temperature,e.g., return air stream 143 may ingress sixth return air zone 460 at thesecond temperature. In one or more embodiments, the second temperatureof return air stream 143 may be greater than the first temperature ofreturn air stream 143, e.g., auxiliary direct expansion coil 310 may beconfigured to operate in a heating mode within first return air zone160. Illustratively, the second temperature of return air stream 143 maybe less than the first temperature of return air stream 143, e.g.,auxiliary direct expansion coil 310 may be configured to operate in acooling mode within first return air zone 160.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in seventh return air zone 461, e.g., auxiliary directexpansion coil 310 may be configured to increase or decrease atemperature of air in seventh return air zone 461. Illustratively,return air stream 143 may ingress seventh return air zone 461 at a firsttemperature and return air stream 143 may egress seventh return air zone461 at a second temperature, e.g., return air stream 143 may ingresssecond return air zone 161 at the second temperature. In one or moreembodiments, the second temperature of return air stream 143 may begreater than the first temperature of return air stream 143, e.g.,auxiliary direct expansion coil 310 may be configured to operate in aheating mode within seventh return air zone 461. Illustratively, thesecond temperature of return air stream 143 may be less than the firsttemperature of return air stream 143, e.g., auxiliary direct expansioncoil 310 may be configured to operate in a cooling mode within seventhreturn air zone 461.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in second return air zone 161, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin second return air zone 161. Illustratively, return air stream 143 mayingress second return air zone 161 at a first temperature and return airstream 143 may egress second return air zone 161 at a secondtemperature, e.g., return air stream 143 may ingress third return airzone 162 at the second temperature. In one or more embodiments, thesecond temperature of return air stream 143 may be greater than thefirst temperature of return air stream 143, e.g., auxiliary directexpansion coil 310 may be configured to operate in a heating mode withinsecond return air zone 161. Illustratively, the second temperature ofreturn air stream 143 may be less than the first temperature of returnair stream 143, e.g., auxiliary direct expansion coil 310 may beconfigured to operate in a cooling mode within second return air zone161.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in third return air zone 162, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin third return air zone 162. Illustratively, return air stream 143 mayingress third return air zone 162 at a first temperature and return airstream 143 may egress third return air zone 162 at a second temperature,e.g., return air stream 143 may ingress fourth return air zone 163 atthe second temperature. In one or more embodiments, the secondtemperature of return air stream 143 may be greater than the firsttemperature of return air stream 143, e.g., auxiliary direct expansioncoil 310 may be configured to operate in a heating mode within thirdreturn air zone 162. Illustratively, the second temperature of returnair stream 143 may be less than the first temperature of return airstream 143, e.g., auxiliary direct expansion coil 310 may be configuredto operate in a cooling mode within third return air zone 162.

In one or more embodiments, auxiliary direct expansion coil 310 may bedisposed in fourth return air zone 163, e.g., auxiliary direct expansioncoil 310 may be configured to increase or decrease a temperature of airin fourth return air zone 163. Illustratively, return air stream 143 mayingress fourth return air zone 163 at a first temperature and return airstream 143 may egress fourth return air zone 163 at a secondtemperature, e.g., return air stream 143 may egress fourth return airzone 163 at the second temperature as exhaust air stream 144. In one ormore embodiments, the second temperature of return air stream 143 may begreater than the first temperature of return air stream 143, e.g.,auxiliary direct expansion coil 310 may be configured to operate in aheating mode within fourth return air zone 163. Illustratively, thesecond temperature of return air stream 143 may be less than the firsttemperature of return air stream 143, e.g., auxiliary direct expansioncoil 310 may be configured to operate in a cooling mode within fourthreturn air zone 163.

In one or more embodiments, high efficiency ventilation system with anauxiliary coil in return air stream 400 may comprise a high efficiencyventilation system in a heat pump configuration 100. Illustratively,direct expansion coil 110 may be directly or indirectly connected to afirst refrigerant flow controlling condensing unit 105, e.g., directexpansion coil 110 and a first refrigerant flow controlling condensingunit 105 be configured to operate in a heat pump configuration or a heatrecovery configuration. In one or more embodiments, auxiliary directexpansion coil 310 may be directly or indirectly connected to a secondrefrigerant flow controlling condensing unit 105, e.g., auxiliary directexpansion coil 310 and a second refrigerant flow controlling condensingunit 105 may be configured to operate in a heat pump configuration or aheat recovery configuration. Illustratively, direct expansion coil 110and a first refrigerant flow controlling condensing unit 105 may beconfigured to operate in a heat pump configuration and auxiliary directexpansion coil 310 and a second refrigerant flow controlling condensingunit 105 may be configured to simultaneously operate in a heat pumpconfiguration. In one or more embodiments, direct expansion coil 110 anda first refrigerant flow controlling condensing unit 105 may beconfigured to operate in a heat recovery configuration and auxiliarydirect expansion coil 310 and a second refrigerant flow controllingcondensing unit 105 may be configured to simultaneously operate in aheat recovery configuration. Illustratively, direct expansion coil 110and a first refrigerant flow controlling condensing unit 105 may beconfigured to operate in a heat recovery configuration and auxiliarydirect expansion coil 310 and a second refrigerant flow controllingcondensing unit 105 may be configured to simultaneously operate in aheat pump configuration. In one or more embodiments, direct expansioncoil 110 and a first refrigerant flow controlling condensing unit 105may be configured to operate in a heat pump configuration and auxiliarydirect expansion coil 310 and a second refrigerant flow controllingcondensing unit 105 may be configured to simultaneously operate in aheat recovery configuration.

FIG. 5 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary refrigerant flow controlling condensing unitfor outside air stream 500. In one or more embodiments, high efficiencyventilation system with an auxiliary refrigerant flow controllingcondensing unit for outside air stream 500 may comprise a refrigerantflow controlling condensing unit 105, an auxiliary refrigerant flowcontrolling condensing unit 505, a direct expansion coil 110, anauxiliary direct expansion coil 310, a bypass mechanism 305, a firstbranch selector unit 210, a second branch selector unit 220, a thirdbranch selector unit 330, a fourth branch selector unit 520, a fan coilunit 230, and an auxiliary fan coil unit 530. Illustratively, firstbranch selector unit 210 may be disposed between refrigerant flowcontrolling condensing unit 105 and direct expansion coil 110. In one ormore embodiments, first branch selector unit 210 may be directly orindirectly connected to direct expansion coil 110 by liquid line 106 andgas and suction line 107. Illustratively, refrigerant flow controllingcondensing unit 105 may be configured to facilitate a transfer of arefrigerant from refrigerant flow controlling condensing unit 105 tofirst branch selector unit 210. In one or more embodiments, refrigerantflow controlling condensing unit 105 may be configured to facilitate atransfer of a refrigerant from first branch selector unit 210 torefrigerant flow controlling condensing unit 105. Illustratively, firstbranch selector unit 210 may be directly or indirectly connected torefrigerant flow controlling condensing unit 105 by a gas and suctionline 206, a suction line 207, and a liquid line 208. In one or moreembodiments, first branch selector unit 210 may be connected to gas andsuction line 206 at a gas and suction line junction 216, e.g., firstbranch selector unit 210 may be connected to gas and suction linejunction 216 by a first branch selector unit gas and suction line 211.Illustratively, first branch selector unit 210 may be connected tosuction line 207 at a suction line junction 217, e.g., first branchselector unit 210 may be connected to suction line junction 217 by afirst branch selector unit suction line 212. In one or more embodiments,first branch selector unit 210 may be connected to liquid line 208 at aliquid line junction 218, e.g., first branch selector unit 210 may beconnected to liquid line junction 218 by a first branch selector unitliquid line 213. Illustratively, first branch selector unit 210 may beconfigured to facilitate a transfer of a refrigerant from first branchselector unit 210 to direct expansion coil 110. In one or moreembodiments, first branch selector unit 210 may be configured tofacilitate a transfer of a refrigerant from direct expansion coil 110 tofirst branch selector unit 210. Illustratively, first branch selectorunit 210 may be configured to facilitate a transfer of a refrigerantfrom refrigerant flow controlling condensing unit 105 to directexpansion coil 110. In one or more embodiments, first branch selectorunit 210 may be configured to facilitate a transfer of a refrigerantfrom direct expansion coil 110 to refrigerant flow controllingcondensing unit 105.

Illustratively, second branch selector unit 220 may be disposed betweenrefrigerant flow controlling condensing unit 105 and fan coil unit 230.In one or more embodiments, second branch selector unit 220 may bedirectly or indirectly connected to fan coil unit 230 by fan coil liquidline 226 and fan coil gas and suction line 227. Illustratively,refrigerant flow controlling condensing unit 105 may be configured tofacilitate a transfer of a refrigerant from refrigerant flow controllingcondensing unit 105 to second branch selector unit 220. In one or moreembodiments, refrigerant flow controlling condensing unit 105 may beconfigured to facilitate a transfer of a refrigerant from second branchselector unit 220 to refrigerant flow controlling condensing unit 105.Illustratively, second branch selector unit 220 may be directly orindirectly connected to refrigerant flow controlling condensing unit 105by gas and suction line 206, suction line 207, and liquid line 208. Inone or more embodiments, second branch selector unit 220 may beconnected to gas and suction line 206 at gas and suction line junction216, e.g., second branch selector unit 220 may be connected to gas andsuction line junction 216 by a second branch selector unit gas andsuction line 221. Illustratively, second branch selector unit 220 may beconnected to suction line 207 at suction line junction 217, e.g., secondbranch selector unit 220 may be connected to suction line junction 217by a second branch selector unit suction line 222. In one or moreembodiments, second branch selector unit 220 may be connected to liquidline 208 at liquid line junction 218, e.g., second branch selector unit220 may be connected to liquid line junction 218 by a second branchselector unit liquid line 223. Illustratively, second branch selectorunit 220 may be configured to facilitate a transfer of a refrigerantfrom second branch selector unit 220 to fan coil unit 230. In one ormore embodiments, second branch selector unit 220 may be configured tofacilitate a transfer of a refrigerant from fan coil unit 230 to secondbranch selector unit 220. Illustratively, second branch selector unit220 may be configured to facilitate a transfer of a refrigerant fromrefrigerant flow controlling condensing unit 105 to fan coil unit 230.In one or more embodiments, second branch selector unit 220 may beconfigured to facilitate a transfer of a refrigerant from fan coil unit230 to refrigerant flow controlling condensing unit 105.

In one or more embodiments, third branch selector unit 330 may bedisposed between auxiliary direct expansion coil 310 and auxiliaryrefrigerant flow controlling condensing unit 505. Illustratively, thirdbranch selector unit 330 may be directly or indirectly connected toauxiliary direct expansion coil 310 by liquid line 306 and gas andsuction line 307. In one or more embodiments, auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to facilitate atransfer of a refrigerant from auxiliary refrigerant flow controllingcondensing unit 505 to third branch selector unit 330. Illustratively,auxiliary refrigerant flow controlling condensing unit 505 may beconfigured to facilitate a transfer of a refrigerant from third branchselector unit 330 to auxiliary refrigerant flow controlling condensingunit 505. In one or more embodiments, third branch selector unit 330 maybe directly or indirectly connected to auxiliary refrigerant flowcontrolling condensing unit 505 by a gas and suction line 506, a suctionline 507, and a liquid line 508. Illustratively, third branch selectorunit 330 may be connected to gas and suction line 506 at a gas linejunction. In one or more embodiments, third branch selector unit 330 maybe connected to suction line 507 at a suction line junction.Illustratively, third branch selector unit 330 may be connected toliquid line 508 at a liquid line junction. In one or more embodiments,third branch selector unit 330 may be configured to facilitate atransfer of a refrigerant from third branch selector unit 330 toauxiliary direct expansion coil 310. Illustratively, third branchselector unit 330 may be configured to facilitate a transfer of arefrigerant from auxiliary direct expansion coil 310 to third branchselector unit 330. In one or more embodiments, third branch selectorunit 330 may be configured to facilitate a transfer of a refrigerantfrom auxiliary refrigerant flow controlling condensing unit 505 toauxiliary direct expansion coil 310. Illustratively, third branchselector unit 330 may be configured to facilitate a transfer of arefrigerant from auxiliary direct expansion coil 310 to auxiliaryrefrigerant flow controlling condensing unit 505.

Illustratively, fourth branch selector unit 520 may be disposed betweenauxiliary refrigerant flow controlling condensing unit 505 and auxiliaryfan coil unit 530. In one or more embodiments, fourth branch selectorunit 520 may be directly or indirectly connected to auxiliary fan coilunit 530 by auxiliary fan coil liquid line 526 and auxiliary fan coilgas and suction line 527. Illustratively, auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to facilitate atransfer of a refrigerant from auxiliary refrigerant flow controllingcondensing unit 505 to fourth branch selector unit 520. In one or moreembodiments, auxiliary refrigerant flow controlling condensing unit 505may be configured to facilitate a transfer of a refrigerant from fourthbranch selector unit 520 to auxiliary refrigerant flow controllingcondensing unit 505. Illustratively, fourth branch selector unit 520 maybe directly or indirectly connected to auxiliary refrigerant flowcontrolling condensing unit 505 by gas and suction line 506, suctionline 507, and liquid line 508. In one or more embodiments, fourth branchselector unit 520 may be connected to gas and suction line 506 at gasand suction line junction 516, e.g., fourth branch selector unit 520 maybe connected to gas and suction line junction 516 by a fourth branchselector unit gas and suction line 521. For example, gas and suctionline junction 516 may comprise a Refnet joint. Illustratively, fourthbranch selector unit 520 may be connected to suction line 507 at suctionline junction 517, e.g., fourth branch selector unit 520 may beconnected to suction line junction 517 by a fourth branch selector unitsuction line 522. For example, suction line 517 may comprise a Refnetjoint. In one or more embodiments, fourth branch selector unit 520 maybe connected to liquid line 508 at liquid line junction 518, e.g.,fourth branch selector unit 520 may be connected to liquid line junction518 by a fourth branch selector unit liquid line 523. For example,liquid line junction 518 may comprise a Refnet joint. Illustratively,fourth branch selector unit 520 may be configured to facilitate atransfer of a refrigerant from fourth branch selector unit 520 toauxiliary fan coil unit 530. In one or more embodiments, fourth branchselector unit 520 may be configured to facilitate a transfer of arefrigerant from auxiliary fan coil unit 530 to fourth branch selectorunit 520. Illustratively, fourth branch selector unit 520 may beconfigured to facilitate a transfer of a refrigerant from auxiliaryrefrigerant flow controlling condensing unit 505 to auxiliary fan coilunit 530. In one or more embodiments, fourth branch selector unit 520may be configured to facilitate a transfer of a refrigerant fromauxiliary fan coil unit 530 to auxiliary refrigerant flow controllingcondensing unit 505.

Illustratively, first branch selector unit 210, second branch selectorunit 220, third branch selector unit 330, and fourth branch selectorunit 520 may comprise a single branch selector unit, e.g., first branchselector unit 210, second branch selector unit 220, third branchselector unit 330, and fourth branch selector unit 520 may comprise amulti-port branch selector. In one or more embodiments, first branchselector unit 210, second branch selector unit 220, third branchselector unit 330, and fourth branch selector unit 520 may compriseindependent multi-port branch selectors, e.g., first branch selectorunit 210 may comprise a first multi-port branch selector, second branchselector unit 220 may comprise a second multi-port branch selector,third branch selector unit 330 may comprise a third multi-port branchselector, and fourth branch selector unit 520 may comprise a fourthmulti-port branch selector. Illustratively, first branch selector unit210, second branch selector unit 220, third branch selector unit 330,and fourth branch selector unit 520 may comprise a single branch circuitcontroller. In one or more embodiments, first branch selector unit 210,second branch selector unit 220, third branch selector unit 330, andfourth branch selector unit 520 may comprise independent branch circuitcontrollers, e.g., first branch selector unit 210 may comprise a firstbranch circuit controller, second branch selector unit 220 may comprisea second branch circuit controller, third branch selector unit 330 maycomprise a third branch circuit controller, and fourth branch selectorunit 520 may comprise a fourth branch circuit controller.Illustratively, first branch selector unit 210, second branch selectorunit 220, third branch selector unit 330, and fourth branch selectorunit 520 may comprise a single branch selector box. In one or moreembodiments, first branch selector unit 210, second branch selector unit220, third branch selector unit 330, and fourth branch selector unit 520may comprise independent branch selector boxes, e.g., first branchselector unit 210 may comprise a first branch selector box, secondbranch selector unit 220 may comprise a second branch selector box,third branch selector unit 330 may comprise a third branch selector box,and fourth branch selector unit 520 may comprise a fourth branchselector box.

Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for outside air stream 500may be configured to ventilate controlled environment 115 by supplyingair at a controlled temperature and humidity via supply air stream 142.In one or more embodiments, high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for outside airstream 500 may be configured to ventilate controlled environment 115 byexhausting air via exhaust air stream 144. Illustratively, highefficiency ventilation system with an auxiliary refrigerant flowcontrolling condensing unit for outside air stream 500 may be configuredto control a temperature of controlled environment 115, e.g., fan coilunit 230 may be configured to increase or decrease a temperature ofcontrolled environment 115. In one or more embodiments, auxiliary fancoil unit 530 may be configured to control a temperature of controlledenvironment 115, e.g., auxiliary fan coil unit 530 may be configured toincrease or decrease a temperature of controlled environment 115. In oneor more embodiments, fan coil unit 230 may be configured to control atemperature of a first zone of controlled environment 115 and auxiliaryfan coil unit 530 may be configured to control a temperature of a secondzone of controlled environment 115. Illustratively, fan coil unit 230and auxiliary fan coil unit 530 may be configured to simultaneouslycontrol a temperature of a first zone of controlled environment 115 anda temperature of a second zone of controlled environment 115.

In one or more embodiments, fan coil unit 230 may be configured tocontrol a temperature of a first controlled environment 115, e.g., fancoil unit 230 may be configured to increase or decrease a temperature ofthe first controlled environment 115. Illustratively, auxiliary fan coilunit 530 may be configured to control a temperature of a secondcontrolled environment 115, e.g., auxiliary fan coil unit 530 may beconfigured to increase or decrease a temperature of the secondcontrolled environment 115. In one or more embodiments, fan coil unit230 and auxiliary fan coil unit 530 may be configured to simultaneouslycontrol a temperature of a first controlled environment 115 and atemperature of a second controlled environment 115. During summerconditions, fan coil unit 230 may be configured to decrease atemperature of a first controlled environment 115 and auxiliary fan coilunit 530 may be configured to decrease a temperature of a secondcontrolled environment 115. During winter conditions, fan coil unit 230may be configured to increase a temperature of a first controlledenvironment 115 and auxiliary fan coil unit 530 may be configured toincrease a temperature of a second controlled environment 115. In one ormore embodiments, direct expansion coil 110 and auxiliary directexpansion coil 310 may be configured to increase a temperature ofoutside air stream 141 and fan coil unit 230 may be configured tosimultaneously increase a temperature of a first controlled environment115, e.g., auxiliary fan coil unit 530 may be configured tosimultaneously increase a temperature of a second controlled environment115. Illustratively, direct expansion coil 110 and auxiliary directexpansion coil 310 may be configured to increase a temperature ofoutside air stream 141 and fan coil unit 230 may be configured tosimultaneously increase or decrease a temperature of a first controlledenvironment 115, e.g., auxiliary fan coil unit 530 may be configured tosimultaneously increase or decrease a temperature of a second controlledenvironment 115. In one or more embodiments, direct expansion coil 110and auxiliary direct expansion coil 310 may be configured to increase atemperature of outside air stream 141 and fan coil unit 230 may beconfigured to simultaneously increase or decrease a temperature of afirst controlled environment 115, e.g., auxiliary fan coil unit 530 maybe configured to simultaneously increase or decrease a temperature of asecond controlled environment 115.

In one or more embodiments, high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for outside airstream 500 may comprise a high efficiency ventilation system in a heatrecovery configuration 200. Illustratively, high efficiency ventilationsystem with an auxiliary refrigerant flow controlling condensing unitfor outside air stream 500 may be configured to recover energy from afirst fan coil unit 230 operating in a first mode of operation toimprove an operating efficiency of a second fan coil unit 230 operatingin a second mode of operation. In one or more embodiments, highefficiency ventilation system with an auxiliary refrigerant flowcontrolling condensing unit for outside air stream 500 may be configuredto recover energy from a first auxiliary fan coil unit 530 operating ina first mode of operation to improve an operating efficiency of a secondauxiliary fan coil unit 530 operating in a second mode of operation.Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for outside air stream 500may be configured to recover energy from one or more fan coil units 230or one or more auxiliary fan coil units 530 to improve an operatingefficiency of direct expansion coil 110 or auxiliary direct expansioncoil 310. In one or more embodiments, high efficiency ventilation systemwith an auxiliary refrigerant flow controlling condensing unit foroutside air stream 500 may be configured to recover energy from one ormore fan coil units 230 to improve an operating efficiency of directexpansion coil 110. Illustratively, high efficiency ventilation systemwith an auxiliary refrigerant flow controlling condensing unit foroutside air stream 500 may be configured to recover energy from one ormore auxiliary fan coil units 530 to improve an operating efficiency ofauxiliary direct expansion coil 310. In one or more embodiments, highefficiency ventilation system with an auxiliary refrigerant flowcontrolling condensing unit for outside air stream 500 may be configuredto recover energy from direct expansion coil 110 or auxiliary directexpansion coil 310 to improve an operating efficiency of one or more fancoil units 230 or one or more auxiliary fan coil units 530.Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for outside air stream 500may be configured to recovery energy from direct expansion coil 110 toimprove an operating efficiency of one or more fan coil units 230. Inone or more embodiments, high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for outside airstream 500 may be configured to recover energy from auxiliary directexpansion coil 310 to improve an operating efficiency of one or moreauxiliary fan coil units 530.

Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for outside air stream 500may be configured to selectively distribute heat recovered from one ormore fan coil units 230 and one or more auxiliary fan coil units 530,e.g., high efficiency ventilation system with an auxiliary refrigerantflow controlling condensing unit for outside air stream 500 may beconfigured to uniformly distribute heat recovered from one or more fancoil units 230 and one or more auxiliary fan coil units 530. In one ormore embodiments, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for outside air stream 500may be configured to distribute heat recovered from one or more fan coilunits 230 and one or more auxiliary fan coil units 530 according to oneor more distribution variables, e.g., high efficiency ventilation systemwith an auxiliary refrigerant flow controlling condensing unit foroutside air stream 500 may be configured to distribute heat recoveredfrom one or more fan coil units 230 and one or more auxiliary fan coilunits 530 according to one or more distribution priorities.Illustratively, a particular fan coil unit 230 may have a higherdistribution priority than direct expansion coil 110, e.g., refrigerantflow controlling condensing unit 105 may be configured to distributeheat recovered from one or more fan coil units 230 to the particular fancoil unit 230 before distributing heat recovered from one or more fancoil units 230 to direct expansion coil 110. For example, refrigerantflow controlling condensing unit 105 may be configured to distributeheat recovered from one or more fan coil units 230 to direct expansioncoil 110 only if the particular fan coil unit 230 is either in a standbymode or is operating in a cooling mode. In one or more embodiments,refrigerant flow controlling condensing unit 105 may be configured todistribute heat recovered from one or more fan coil units 230 to directexpansion coil 110 only if each fan coil unit 230 of the one or more fancoil units 230 is either in a standby mode or is operating in a coolingmode. Illustratively, a particular auxiliary fan coil unit 530 may havea higher distribution priority than auxiliary direct expansion coil 310,e.g., auxiliary refrigerant flow controlling condensing unit 505 may beconfigured to distribute heat recovered from one or more auxiliary fancoil units 530 to the particular auxiliary fan coil unit 530 beforedistributing heat recovered from one or more auxiliary fan coil units530 to auxiliary direct expansion coil 310. For example, auxiliaryrefrigerant flow controlling condensing unit 505 may be configured todistribute heat recovered from one or more auxiliary fan coil units 530to auxiliary direct expansion coil 310 only if the particular auxiliaryfan coil unit 530 is either in a standby mode or is operating in acooling mode. In one or more embodiments, auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to distribute heatrecovered from one or more auxiliary fan coil units 530 to auxiliarydirect expansion coil 310 only if each auxiliary fan coil unit 530 ofthe one or more auxiliary fan coil units 530 is either in a standby modeor is operating in a cooling mode.

Illustratively, refrigerant flow controlling condensing unit 105 may beconfigured to communicate information about excess heating capacity toauxiliary refrigerant flow controlling condensing unit 505 to improve anoperating efficiency of high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for outside airstream 500. In one or more embodiments, refrigerant flow controllingcondenses ing unit 105 may be configured to communicate informationabout heat recovered from one or more fan coil units 230 to auxiliaryrefrigerant flow controlling condensing unit 505, e.g., refrigerant flowcontrolling condensing unit 105 may be configured to communicate toauxiliary refrigerant flow controlling condensing unit 505 thatrecovered heat is available for direct expansion coil 110.Illustratively, auxiliary refrigerant flow controlling condensing unit505 may be configured to receive information from refrigerant flowcontrolling condensing unit 105 and then adjust a heating capacity ofauxiliary direct expansion coil 310, e.g., auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to decrease a heatingcapacity of auxiliary direct expansion coil 310 in response to acommunication that heat recovered from one or more fan coil units 230 isavailable for direct expansion coil 110. In one or more embodiments,auxiliary refrigerant flow controlling condensing unit 505 may beconfigured to communicate information about excess heating capacity torefrigerant flow controlling condensing unit 105 to improve an operatingefficiency of high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for outside air stream 500.Illustratively, auxiliary refrigerant flow controlling condensing unit505 may be configured to communicate information about heat recoveredfrom one or more auxiliary fan coil units 530 to refrigerant flowcontrolling condensing unit 105, e.g., auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to communicate torefrigerant flow controlling condensing unit 105 that recovered heat isavailable for auxiliary direct expansion coil 310. In one or moreembodiments, refrigerant flow controlling condensing unit 105 may beconfigured to receive information from auxiliary refrigerant flowcontrolling condensing unit 505 and then adjust a heating capacity ofdirect expansion coil 110, e.g., refrigerant flow controlling condensingunit 105 may be configured to decrease a heating capacity of directexpansion coil 110 in response to a communication that heat recoveredfrom one or more auxiliary fan coil units 530 is available for auxiliarydirect expansion coil 310.

FIG. 6 is a schematic diagram illustrating a high efficiency ventilationsystem with an auxiliary refrigerant flow controlling condensing unitfor return air stream 600. In one or more embodiments, high efficiencyventilation system with an auxiliary refrigerant flow controllingcondensing unit for return air stream 600 may comprise a refrigerantflow controlling condensing unit 105, an auxiliary refrigerant flowcontrolling condensing unit 505, a direct expansion coil 110, anauxiliary direct expansion coil 310, a bypass mechanism 305, a firstbranch selector unit 210, a second branch selector unit 220, a thirdbranch selector unit 330, a fourth branch selector unit 520, a fan coilunit 230, and an auxiliary fan coil unit 530. Illustratively, firstbranch selector unit 210 may be disposed between refrigerant flowcontrolling condensing unit 105 and direct expansion coil 110. In one ormore embodiments, first branch selector unit 210 may be directly orindirectly connected to direct expansion coil 110 by liquid line 106 andgas and suction line 107. Illustratively, refrigerant flow controllingcondensing unit 105 may be configured to facilitate a transfer of arefrigerant from refrigerant flow controlling condensing unit 105 tofirst branch selector unit 210. In one or more embodiments, refrigerantflow controlling condensing unit 105 may be configured to facilitate atransfer of a refrigerant from first branch selector unit 210 torefrigerant flow controlling condensing unit 105. Illustratively, firstbranch selector unit 210 may be directly or indirectly connected torefrigerant flow controlling condensing unit 105 by a gas and suctionline 206, a suction line 207, and a liquid line 208. In one or moreembodiments, first branch selector unit 210 may be connected to gas andsuction line 206 at a gas and suction line junction 216, e.g., firstbranch selector unit 210 may be connected to gas and suction linejunction 216 by a first branch selector unit gas and suction line 211.Illustratively, first branch selector unit 210 may be connected tosuction line 207 at a suction line junction 217, e.g., first branchselector unit 210 may be connected to suction line junction 217 by afirst branch selector unit suction line 212. In one or more embodiments,first branch selector unit 210 may be connected to liquid line 208 at aliquid line junction 218, e.g., first branch selector unit 210 may beconnected to liquid line junction 218 by a first branch selector unitliquid line 213. Illustratively, first branch selector unit 210 may beconfigured to facilitate a transfer of a refrigerant from first branchselector unit 210 to direct expansion coil 110. In one or moreembodiments, first branch selector unit 210 may be configured tofacilitate a transfer of a refrigerant from direct expansion coil 110 tofirst branch selector unit 210. Illustratively, first branch selectorunit 210 may be configured to facilitate a transfer of a refrigerantfrom refrigerant flow controlling condensing unit 105 to directexpansion coil 110. In one or more embodiments, first branch selectorunit 210 may be configured to facilitate a transfer of a refrigerantfrom direct expansion coil 110 to refrigerant flow controllingcondensing unit 105.

Illustratively, second branch selector unit 220 may be disposed betweenrefrigerant flow controlling condensing unit 105 and fan coil unit 230.In one or more embodiments, second branch selector unit 220 may bedirectly or indirectly connected to fan coil unit 230 by fan coil liquidline 226 and fan coil gas and suction line 227. Illustratively,refrigerant flow controlling condensing unit 105 may be configured tofacilitate a transfer of a refrigerant from refrigerant flow controllingcondensing unit 105 to second branch selector unit 220. In one or moreembodiments, refrigerant flow controlling condensing unit 105 may beconfigured to facilitate a transfer of a refrigerant from second branchselector unit 220 to refrigerant flow controlling condensing unit 105.Illustratively, second branch selector unit 220 may be directly orindirectly connected to refrigerant flow controlling condensing unit 105by gas and suction line 206, suction line 207, and liquid line 208. Inone or more embodiments, second branch selector unit 220 may beconnected to gas and suction line 206 at gas and suction line junction216, e.g., second branch selector unit 220 may be connected to gas andsuction line junction 216 by a second branch selector unit gas andsuction line 221. Illustratively, second branch selector unit 220 may beconnected to suction line 207 at suction line junction 217, e.g., secondbranch selector unit 220 may be connected to suction line junction 217by a second branch selector unit suction line 222. In one or moreembodiments, second branch selector unit 220 may be connected to liquidline 208 at liquid line junction 218, e.g., second branch selector unit220 may be connected to liquid line junction 218 by a second branchselector unit liquid line 223. Illustratively, second branch selectorunit 220 may be configured to facilitate a transfer of a refrigerantfrom second branch selector unit 220 to fan coil unit 230. In one ormore embodiments, second branch selector unit 220 may be configured tofacilitate a transfer of a refrigerant from fan coil unit 230 to secondbranch selector unit 220. Illustratively, second branch selector unit220 may be configured to facilitate a transfer of a refrigerant fromrefrigerant flow controlling condensing unit 105 to fan coil unit 230.In one or more embodiments, second branch selector unit 220 may beconfigured to facilitate a transfer of a refrigerant from fan coil unit230 to refrigerant flow controlling condensing unit 105.

In one or more embodiments, third branch selector unit 330 may bedisposed between auxiliary direct expansion coil 310 and auxiliaryrefrigerant flow controlling condensing unit 505. Illustratively, thirdbranch selector unit 330 may be directly or indirectly connected toauxiliary direct expansion coil 310 by liquid line 306 and gas andsuction line 307. In one or more embodiments, auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to facilitate atransfer of a refrigerant from auxiliary refrigerant flow controllingcondensing unit 505 to third branch selector unit 330. Illustratively,auxiliary refrigerant flow controlling condensing unit 505 may beconfigured to facilitate a transfer of a refrigerant from third branchselector unit 330 to auxiliary refrigerant flow controlling condensingunit 505. In one or more embodiments, third branch selector unit 330 maybe directly or indirectly connected to auxiliary refrigerant flowcontrolling condensing unit 505 by a gas and suction line 506, a suctionline 507, and a liquid line 508. Illustratively, third branch selectorunit 330 may be connected to gas and suction line 506 at a gas linejunction. In one or more embodiments, third branch selector unit 330 maybe connected to suction line 507 at a suction line junction.Illustratively, third branch selector unit 330 may be connected toliquid line 508 at a liquid line junction. In one or more embodiments,third branch selector unit 330 may be configured to facilitate atransfer of a refrigerant from third branch selector unit 330 toauxiliary direct expansion coil 310. Illustratively, third branchselector unit 330 may be configured to facilitate a transfer of arefrigerant from auxiliary direct expansion coil 310 to third branchselector unit 330. In one or more embodiments, third branch selectorunit 330 may be configured to facilitate a transfer of a refrigerantfrom auxiliary refrigerant flow controlling condensing unit 505 toauxiliary direct expansion coil 310. Illustratively, third branchselector unit 330 may be configured to facilitate a transfer of arefrigerant from auxiliary direct expansion coil 310 to auxiliaryrefrigerant flow controlling condensing unit 505.

Illustratively, fourth branch selector unit 520 may be disposed betweenauxiliary refrigerant flow controlling condensing unit 505 and auxiliaryfan coil unit 530. In one or more embodiments, fourth branch selectorunit 520 may be directly or indirectly connected to auxiliary fan coilunit 530 by auxiliary fan coil liquid line 526 and auxiliary fan coilgas and suction line 527. Illustratively, auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to facilitate atransfer of a refrigerant from auxiliary refrigerant flow controllingcondensing unit 505 to fourth branch selector unit 520. In one or moreembodiments, auxiliary refrigerant flow controlling condensing unit 505may be configured to facilitate a transfer of a refrigerant from fourthbranch selector unit 520 to auxiliary refrigerant flow controllingcondensing unit 505. Illustratively, fourth branch selector unit 520 maybe directly or indirectly connected to auxiliary refrigerant flowcontrolling condensing unit 505 by gas and suction line 506, suctionline 507, and liquid line 508. In one or more embodiments, fourth branchselector unit 520 may be connected to gas and suction line 506 at gasand suction line junction 516, e.g., fourth branch selector unit 520 maybe connected to gas and suction line junction 516 by a fourth branchselector unit gas and suction line 521. Illustratively, fourth branchselector unit 520 may be connected to suction line 507 at suction linejunction 517, e.g., fourth branch selector unit 520 may be connected tosuction line junction 517 by a fourth branch selector unit suction line522. In one or more embodiments, fourth branch selector unit 520 may beconnected to liquid line 508 at liquid line junction 518, e.g., fourthbranch selector unit 520 may be connected to liquid line junction 518 bya fourth branch selector unit liquid line 523. Illustratively, fourthbranch selector unit 520 may be configured to facilitate a transfer of arefrigerant from fourth branch selector unit 520 to auxiliary fan coilunit 530. In one or more embodiments, fourth branch selector unit 520may be configured to facilitate a transfer of a refrigerant fromauxiliary fan coil unit 530 to fourth branch selector unit 520.Illustratively, fourth branch selector unit 520 may be configured tofacilitate a transfer of a refrigerant from auxiliary refrigerant flowcontrolling condensing unit 505 to auxiliary fan coil unit 530. In oneor more embodiments, fourth branch selector unit 520 may be configuredto facilitate a transfer of a refrigerant from auxiliary fan coil unit530 to auxiliary refrigerant flow controlling condensing unit 505.

Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for return air stream 600may be configured to ventilate controlled environment 115 by supplyingair at a controlled temperature and humidity via supply air stream 142.In one or more embodiments, high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for return airstream 600 may be configured to ventilate controlled environment 115 byexhausting air via exhaust air stream 144. Illustratively, highefficiency ventilation system with an auxiliary refrigerant flowcontrolling condensing unit for return air stream 600 may be configuredto control a temperature of controlled environment 115, e.g., fan coilunit 230 may be configured to increase or decrease a temperature ofcontrolled environment 115. In one or more embodiments, auxiliary fancoil unit 530 may be configured to control a temperature of controlledenvironment 115, e.g., auxiliary fan coil unit 530 may be configured toincrease or decrease a temperature of controlled environment 115. In oneor more embodiments, fan coil unit 230 may be configured to control atemperature of a first zone of controlled environment 115 and auxiliaryfan coil unit 530 may be configured to control a temperature of a secondzone of controlled environment 115. Illustratively, fan coil unit 230and auxiliary fan coil unit 530 may be configured to simultaneouslycontrol a temperature of a first zone of controlled environment 115 anda temperature of a second zone of controlled environment 115.

In one or more embodiments, fan coil unit 230 may be configured tocontrol a temperature of a first controlled environment 115, e.g., fancoil unit 230 may be configured to increase or decrease a temperature ofthe first controlled environment 115. Illustratively, auxiliary fan coilunit 530 may be configured to control a temperature of a secondcontrolled environment 115, e.g., auxiliary fan coil unit 530 may beconfigured to increase or decrease a temperature of the secondcontrolled environment 115. In one or more embodiments, fan coil unit230 and auxiliary fan coil unit 530 may be configured to simultaneouslycontrol a temperature of a first controlled environment 115 and atemperature of a second controlled environment 115. During summerconditions, fan coil unit 230 may be configured to decrease atemperature of a first controlled environment 115 and auxiliary fan coilunit 530 may be configured to decrease a temperature of a secondcontrolled environment 115. During winter conditions, fan coil unit 230may be configured to increase a temperature of a first controlledenvironment 115 and auxiliary fan coil unit 530 may be configured toincrease a temperature of a second controlled environment 115. In one ormore embodiments, direct expansion coil 110 and auxiliary directexpansion coil 310 may be configured to increase a temperature ofoutside air stream 141 and fan coil unit 230 may be configured tosimultaneously increase a temperature of a first controlled environment115, e.g., auxiliary fan coil unit 530 may be configured tosimultaneously increase a temperature of a second controlled environment115. Illustratively, direct expansion coil 110 and auxiliary directexpansion coil 310 may be configured to increase a temperature ofoutside air stream 141 and fan coil unit 230 may be configured tosimultaneously increase or decrease a temperature of a first controlledenvironment 115, e.g., auxiliary fan coil unit 530 may be configured tosimultaneously increase or decrease a temperature of a second controlledenvironment 115. In one or more embodiments, direct expansion coil 110and auxiliary direct expansion coil 310 may be configured to increase atemperature of outside air stream 141 and fan coil unit 230 may beconfigured to simultaneously increase or decrease a temperature of afirst controlled environment 115, e.g., auxiliary fan coil unit 530 maybe configured to simultaneously increase or decrease a temperature of asecond controlled environment 115.

In one or more embodiments, high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for return airstream 600 may comprise a high efficiency ventilation system in a heatrecovery configuration 200. Illustratively, high efficiency ventilationsystem with an auxiliary refrigerant flow controlling condensing unitfor return air stream 600 may be configured to recover energy from afirst fan coil unit 230 operating in a first mode of operation toimprove an operating efficiency of a second fan coil unit 230 operatingin a second mode of operation. In one or more embodiments, highefficiency ventilation system with an auxiliary refrigerant flowcontrolling condensing unit for return air stream 600 may be configuredto recover energy from a first auxiliary fan coil unit 530 operating ina first mode of operation to improve an operating efficiency of a secondauxiliary fan coil unit 530 operating in a second mode of operation.Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for return air stream 600may be configured to recover energy from one or more fan coil units 230or one or more auxiliary fan coil units 530 to improve an operatingefficiency of direct expansion coil 110 or auxiliary direct expansioncoil 310. In one or more embodiments, high efficiency ventilation systemwith an auxiliary refrigerant flow controlling condensing unit forreturn air stream 600 may be configured to recover energy from one ormore fan coil units 230 to improve an operating efficiency of directexpansion coil 110. Illustratively, high efficiency ventilation systemwith an auxiliary refrigerant flow controlling condensing unit forreturn air stream 600 may be configured to recover energy from one ormore auxiliary fan coil units 530 to improve an operating efficiency ofauxiliary direct expansion coil 310. In one or more embodiments, highefficiency ventilation system with an auxiliary refrigerant flowcontrolling condensing unit for return air stream 600 may be configuredto recover energy from direct expansion coil 110 or auxiliary directexpansion coil 310 to improve an operating efficiency of one or more fancoil units 230 or one or more auxiliary fan coil units 530.Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for return air stream 600may be configured to recovery energy from direct expansion coil 110 toimprove an operating efficiency of one or more fan coil units 230. Inone or more embodiments, high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for return airstream 600 may be configured to recover energy from auxiliary directexpansion coil 310 to improve an operating efficiency of one or moreauxiliary fan coil units 530.

Illustratively, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for return air stream 600may be configured to selectively distribute heat recovered from one ormore fan coil units 230 and one or more auxiliary fan coil units 530,e.g., high efficiency ventilation system with an auxiliary refrigerantflow controlling condensing unit for return air stream 600 may beconfigured to uniformly distribute heat recovered from one or more fancoil units 230 and one or more auxiliary fan coil units 530. In one ormore embodiments, high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for return air stream 600may be configured to distribute heat recovered from one or more fan coilunits 230 and one or more auxiliary fan coil units 530 according to oneor more distribution variables, e.g., high efficiency ventilation systemwith an auxiliary refrigerant flow controlling condensing unit forreturn air stream 600 may be configured to distribute heat recoveredfrom one or more fan coil units 230 and one or more auxiliary fan coilunits 530 according to one or more distribution priorities.Illustratively, a particular fan coil unit 230 may have a higherdistribution priority than direct expansion coil 110, e.g., refrigerantflow controlling condensing unit 105 may be configured to distributeheat recovered from one or more fan coil units 230 to the particular fancoil unit 230 before distributing heat recovered from one or more fancoil units 230 to direct expansion coil 110. For example, refrigerantflow controlling condensing unit 105 may be configured to distributeheat recovered from one or more fan coil units 230 to direct expansioncoil 110 only if the particular fan coil unit 230 is either in a standbymode or is operating in a cooling mode. In one or more embodiments,refrigerant flow controlling condensing unit 105 may be configured todistribute heat recovered from one or more fan coil units 230 to directexpansion coil 110 only if each fan coil unit 230 of the one or more fancoil units 230 is either in a standby mode or is operating in a coolingmode. Illustratively, a particular auxiliary fan coil unit 530 may havea higher distribution priority than auxiliary direct expansion coil 310,e.g., auxiliary refrigerant flow controlling condensing unit 505 may beconfigured to distribute heat recovered from one or more auxiliary fancoil units 530 to the particular auxiliary fan coil unit 530 beforedistributing heat recovered from one or more auxiliary fan coil units530 to auxiliary direct expansion coil 310. For example, auxiliaryrefrigerant flow controlling condensing unit 505 may be configured todistribute heat recovered from one or more auxiliary fan coil units 530to auxiliary direct expansion coil 310 only if the particular auxiliaryfan coil unit 530 is either in a standby mode or is operating in acooling mode. In one or more embodiments, auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to distribute heatrecovered from one or more auxiliary fan coil units 530 to auxiliarydirect expansion coil 310 only if each auxiliary fan coil unit 530 ofthe one or more auxiliary fan coil units 530 is either in a standby modeor is operating in a cooling mode.

Illustratively, refrigerant flow controlling condensing unit 105 may beconfigured to communicate information about excess heating capacity toauxiliary refrigerant flow controlling condensing unit 505 to improve anoperating efficiency of high efficiency ventilation system with anauxiliary refrigerant flow controlling condensing unit for return airstream 600. In one or more embodiments, refrigerant flow controllingcondensing unit 105 may be configured to communicate information aboutheat recovered from one or more fan coil units 230 to auxiliaryrefrigerant flow controlling condensing unit 505, e.g., refrigerant flowcontrolling condensing unit 105 may be configured to communicate toauxiliary refrigerant flow controlling condensing unit 505 thatrecovered heat is available for direct expansion coil 110.Illustratively, auxiliary refrigerant flow controlling condensing unit505 may be configured to receive information from refrigerant flowcontrolling condensing unit 105 and then adjust a heating capacity ofauxiliary direct expansion coil 310, e.g., auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to decrease a heatingcapacity of auxiliary direct expansion coil 310 in response to acommunication that heat recovered from one or more fan coil units 230 isavailable for direct expansion coil 110. In one or more embodiments,auxiliary refrigerant flow controlling condensing unit 505 may beconfigured to communicate information about excess heating capacity torefrigerant flow controlling condensing unit 105 to improve an operatingefficiency of high efficiency ventilation system with an auxiliaryrefrigerant flow controlling condensing unit for return air stream 600.Illustratively, auxiliary refrigerant flow controlling condensing unit505 may be configured to communicate information about heat recoveredfrom one or more auxiliary fan coil units 530 to refrigerant flowcontrolling condensing unit 105, e.g., auxiliary refrigerant flowcontrolling condensing unit 505 may be configured to communicate torefrigerant flow controlling condensing unit 105 that recovered heat isavailable for auxiliary direct expansion coil 310. In one or moreembodiments, refrigerant flow controlling condensing unit 105 may beconfigured to receive information from auxiliary refrigerant flowcontrolling condensing unit 505 and then adjust a heating capacity ofdirect expansion coil 110, e.g., refrigerant flow controlling condensingunit 105 may be configured to decrease a heating capacity of directexpansion coil 110 in response to a communication that heat recoveredfrom one or more auxiliary fan coil units 530 is available for auxiliarydirect expansion coil 310.

The foregoing description has been directed to particular embodiments ofthis invention. It will be apparent; however, that other variations andmodifications may be made to the described embodiments, with theattainment of some or all of their advantages. Specifically, it shouldbe noted that the principles of the present invention may be implementedin any system. Furthermore, while this description has been written interms of a system for heating, ventilation, and air conditioning, theteachings of the present invention are equally suitable to any systemswhere the functionality may be employed. Therefore, it is the object ofthe appended claims to cover all such variations and modifications ascome within the true spirit and scope of the invention.

What is claimed is:
 1. A system comprising: a supply air streamconfigured to supply a supply air to a controlled environment; a returnair stream configured to remove a return air from the controlledenvironment; a partition configured to separate the supply air streamand the return air stream; an energy recovery ventilator; a heatrecovery ventilator; a first direct expansion coil configured toincrease or decrease a temperature of an air in a supply air zone, thefirst direct expansion coil disposed between the energy recoveryventilator and the heat recovery ventilator; a first refrigerant flowcontrolling condensing unit configured to directly or indirectlytransfer refrigerant to the first direct expansion coil; a second directexpansion coil configured to increase or decrease a temperature of anair in a return air zone, the second direct expansion coil disposedbetween the heat recovery ventilator and the controlled environment; asecond refrigerant flow controlling condensing unit configured todirectly or indirectly transfer refrigerant to the second directexpansion coil; a first branch selector unit, the first branch selectorunit disposed between the second direct expansion coil and the secondrefrigerant flow controlling condensing unit; a fan coil unit configuredto increase or decrease a temperature of air wherein the system isconfigured to selectively distribute a heat recovered from the fan coilunit to the second direct expansion coil; and a second branch selectorunit, the second branch selector unit disposed between the first branchselector unit and the fan coil unit.
 2. The system of claim 1 whereinthe energy recovery ventilator is configured to recover sensible energyand latent energy.
 3. The system of claim 2 wherein the heat recoveryventilator is configured to recover sensible energy.
 4. The system ofclaim 1 wherein the first direct expansion coil is configured toincrease or decrease a temperature of the supply air stream.
 5. Thesystem of claim 1 wherein the second direct expansion coil is configuredto increase or decrease a temperature of the return air stream.
 6. Thesystem of claim 1 wherein the fan coil unit is configured to increase ordecrease a temperature of air in the controlled environment.
 7. Thesystem of claim 1 wherein the first direct expansion coil is disposeddownstream of the energy recovery ventilator.
 8. The system of claim 1wherein the first direct expansion coil is disposed upstream of the heatrecovery ventilator.
 9. The system of claim 1 wherein the energyrecovery ventilator is an energy recovery wheel.
 10. The system of claim1 wherein the energy recovery ventilator is configured to transfer amoisture between the supply air stream and the return air stream. 11.The system of claim 10 wherein the energy recovery ventilator isconfigured to increase a humidity of the supply air stream.
 12. Thesystem of claim 10 wherein the energy recovery ventilator is configuredto decrease a humidity of the supply air stream.
 13. The system of claim10 wherein the energy recovery ventilator is configured to increase ahumidity of the return air stream.
 14. The system of claim 10 whereinthe energy recovery ventilator is configured to decrease a humidity ofthe return air stream.
 15. The system of claim 1 wherein the energyrecovery ventilator is an active desiccant wheel.
 16. The system ofclaim 1 wherein the energy recovery ventilator is a passive desiccantwheel.
 17. The system of claim 1 wherein the energy recovery ventilatoris a fixed-plate heat exchanger.
 18. The system of claim 1 wherein theenergy recovery ventilator is a heat pipe heat exchanger.
 19. A systemcomprising: a supply air stream configured to supply a supply air to acontrolled environment; a return air stream configured to remove areturn air from the controlled environment; a partition configured toseparate the supply air stream and the return air stream; an energyrecovery ventilator configured to recover sensible energy and latentenergy; a heat recovery ventilator configured to recover sensibleenergy; a first direct expansion coil configured to increase or decreasea temperature of an air in a supply air zone, the first direct expansioncoil disposed between the energy recovery ventilator and the heatrecovery ventilator; a first refrigerant flow controlling condensingunit configured to directly or indirectly transfer refrigerant to thefirst direct expansion coil; a second direct expansion coil configuredto increase or decrease a temperature of an air in a return air zone,the second direct expansion coil disposed between the heat recoveryventilator and the controlled environment; a second refrigerant flowcontrolling condensing unit configured to directly or indirectlytransfer refrigerant to the second direct expansion coil; a first branchselector unit, the first branch selector unit disposed between thesecond direct expansion coil and the second refrigerant flow controllingcondensing unit; a fan coil unit configured to increase or decrease atemperature of air; and a second branch selector unit, the second branchselector unit disposed between the first branch selector unit and thefan coil unit wherein the system is configured to distribute a heatrecovered from the fan coil unit to the second direct expansion coilaccording to one or more distribution variables that define conditionsfor distributing the heat recovered from the fan coil unit.
 20. A systemcomprising: a supply air stream configured to supply a supply air to acontrolled environment; a return air stream configured to remove areturn air from the controlled environment; a partition configured toseparate the supply air stream and the return air stream; an energyrecovery ventilator configured to recover sensible energy and latentenergy; a heat recovery ventilator configured to recover sensibleenergy; a first direct expansion coil configured to increase or decreasea temperature of the supply air stream, the first direct expansion coildisposed between the energy recovery ventilator and the heat recoveryventilator; a first refrigerant flow controlling condensing unitconfigured to directly or indirectly transfer refrigerant to the firstdirect expansion coil; a second direct expansion coil configured toincrease or decrease a temperature of the return air stream, the seconddirect expansion coil disposed between the heat recovery ventilator andthe controlled environment; a second refrigerant flow controllingcondensing unit configured to directly or indirectly transferrefrigerant to the second direct expansion coil; a first branch selectorunit, the first branch selector unit disposed between the second directexpansion coil and the second refrigerant flow controlling condensingunit; a fan coil unit configured to increase or decrease a temperatureof air; and a second branch selector unit, the second branch selectorunit disposed between the first branch selector unit and the fan coilunit wherein the system is configured to distribute a heat recoveredfrom the fan coil unit to the second direct expansion coil according toone or more distribution priorities that define relative priorities fordistributing the heat recovered from the fan coil unit.